It ain't easy to make new bombs from scratch, really. :)

Though I'm just one guy, so you might wanna hear out the others on the forum.

Acute Bomb

Question 2) Umm.. The damage is same like Nitronome but the Fuse Bomb radius is smaller than Nitronome. The colour of explosion is like Gremlin Mortafire rocket explosion.
Aesthetics aside, there's your problem.
You're essentially making a weaker version of the Nitronome that:

1. Has a smaller blast radius.
2. Takes significantly longer to activate.

If anything, the tactical benefits of using such a bomb are outweighed by its sluggish use, and an experienced bomber can use a Nitronome for strategic positioning just as easily.

You could overcome this by several means, though:

1. Bump up the damage, though this could just make it another BAB.

2. Increase the number of bombs you can set down at once.
This means that you can strategically place bombs more effectively, a la Sticky Bombs in TF2.
The problem with this is that it will be tricky to implement a system to detonate all bombs at once.

"Fuse Bomb: You can only have one out at a time and it must be manually detonated or wait 20 seconds. It has the damage of Nitronome but with a smaller blast range."

Bombs are designed to detonate automatically when their fuse ends, indicated by a ring which has to meet the blast range to detonate. This weapon is essentially a timed sticky bomb but only one may be placed at a time; consider changing this to three at a time and they may be manually detonated without the time limit. It may have the damage of Nitronome but lacks its convenience in damage over time. For this design to be commendable it needs to have at least a couple out at a time; take Catalyzer mines for example. You can have a limited amount of mines out at once but the regular bullet detonates them. Rather than make a bomb copying this weapon, work on how to buff the Catalyzer line to be more useful for practical combat.

"Acute Bomb: You make a triangle out of three of them, which you have to place, and it creates a damage field in the area of effect of 35-58 every 0.5 seconds (70-116 damage per second in the triangle) for 25 seconds (the average glyph bomb, vaporizer and suction, only last a few seconds). The triangle must be in a limited area of range (no planting at the corners of the map for massive damage everywhere, though this cannot be limited due to existing bomb mechanics) and requires immensly complex mathematical processes."

For a damage per second bomb, this requires comparison to existing ones. Assume the following scenarios are at H1, no UV, no damage buffs, with max charge on a neutral target and the target does not have a defense buff/debuff (poison). Keep in mind the "standard" range has a radius of 4.

Nitronome is a 5* bomb with only normal damage; according to the Wiki at H1 on a neutral target (it does normal damage anway) it does a maximum of 203 per target in a standard area of effect. Assuming you have max bomb charge and no bomb damage buffs, it takes three seconds to charge one Nitronome; 203 damage / 3 seconds = 67.66...7 damage/second.

Dark Briar Barrage is a 5* bomb with only pierce damage; other than its damage type and slower fuse speed it has the same damage rate on a neutral target of 67.66...7 damage/second.

Graviton Vortex is a 5* bomb with only shadow damage; it has approximately half the standard blast range though its suction slightly exceeds it. This bomb has a severe movement penalty. Assuming you have max bomb charge and no bomb damage buffs, it takes five seconds and does 153 blast damage after the suction spins for four seconds while keeping enemies stuck as close to the epicenter as possible; 153 damage / 5 seconds = 30.6 damage/second. The suction radius of this bomb is 3.

Ash of Agni is a 5* bomb with only element damage; it has standard blast range but the actual explosion is only approximately one space radius around the epicenter upon detonation. Due to its vaporizer mechanic the main purpose of this bomb is to inflict a status over a large area of effect via a cloud which lasts for five seconds. The cloud gives a "minor" fire which will not be included in the damage formula, but would not match Nitronome or Barrage regardless. The blast damage in the small area of effect around the epicenter upon detonation is the same as Graviton Vortex; 153 damage / 4 seconds = 38.25 damage/second. The actual blast radius for the detonation, not the cloud, is 1.

Big Angry Bomb is a 5* bomb with only normal damage; it has a slightly larger blast range than Graviton Vortex and also has a severe movement penalty. The fuse is fairly slow and the blast itself does a maximum of 258 damage per neutral target. This weapon takes approximately five seconds to charge with max charge buffs; 258 damage / 5 seconds = 51.6 damage/second. The blast radius of this bomb is 2.5.

Radiant Sun Shards is a 4* bomb with split pierce and element damage and has been nerfed by approximately one bar of damage for both; it has an incredibly small blast range which upon detonation releases eight shard projectiles in the normal compass directions (north, northwest, west, southwest, south, southeast, east, northeast) for a long distance. It has the ability to snipe targets from afar if placed correctly without using a gun, but its primary use is to plant next to less mobile enemies so multiple shards make contact with the target. With max bomb charge it takes three seconds and does a maximum of 179 damage per shard on a neutral target (beasts and constructs are considered neutral in this scenario; this bomb has a +3 damage buff against fiends, this is an innate feature of the weapon) and can potentially hit the same target three times if placed close enough; 179 damage (3) / 3 seconds = 179 damage/second (must be placed directly next to the target; this method is often used against Lumbers and turrets and is difficult to take advantage of against more than one enemy at a time while Nitronome deals 67.66...7 damage per second in a large area of effect, potentially hitting approximately 49 enemies at once for a damage rate of 3315.66... damage/second, Barrage is the same with a longer fuse and pierce damage which may affect these figures). The blast radius for three hits is assumed to be 1.

If it is not obvious by now, the highest damage to time ratio in the largest area of effect is Nitronome/Barrage; Nitronome has a shorter fuse (explodes quicker) but its animation delivers a blinding flash and shakes the screen while Barrage gives a darker animation without any shaking of bright flash and instead shows a red hologram Snarbolax jumping. Shards line is not counted here because it is intended for single targets and being planted next to them so multiple shards impact on the target. I explained it anyway. To properly compare maximum potential damage rates (still with the previously given circumstances) I have given all figures required to do so, though I already did Nitronome and Barrage for those who want to know the maximum damage capable. Bombs were designed for area of effect damage.

"But when I use a bomb I just stand in front of the enemy and it hits me and I die so you must be cheating, hurr."

Bomb strafing. You will be able to improve your damage to time ratio to come closer to the maximum rate but it is unlikely for certain bombs to come to this; for example it is highly unlikely a Nitronome/Barrage user will be able to place a bomb directly in the center of 49 enemies which just so happen to be perfectly assembled to fit in the blast range while not moving until it detonates, and all of these enemies are neutral to the damage; hitting thrice with a shards is not only likely but provable, Graviton is more situational mobility support than offensive though may be used as such.

According to the figures of your "Acute Bomb", the weapon forms an awkward triangular area, assumed to match the standard range in terms of surface area, with a maximum of 116 damage per second on a neutral target. This means that the damage rate of this weapon is 1.7 times the currently "highest" damage per second bomb; Dark Retribution is not included due to the only method to obtain it is through a premium mission, though after the double nerf on it I assume it is currently either approximately the same damage rate as Nitronome or below.

I suppose this is where I would grade it, but I would rather have a response addressing previously indicated issues. No, I will not summarize them here.

You're not even reading his points through. It doesn't help that you just say 'it's really helpful'.

@Lugiuru's post:
TL;DR, what he's saying about the Fuse Bomb is:
1. Your Fuse Bomb is an inferior substitute to a Nitronome.
2. For it to be useful, you'll need a couple out at once. Back to my original point of multiple bombs.
3. With respect to point 2, you might as well improve on the Catalyzer rather than make a new bomb that copies it.

And what he's saying about your Acute Bomb is:
1. The triangle shaped area is extremely awkward.
2. Your DPS is 1.7 times that of a Nitronome, arguably the best DPS bomb in-game. i.e. OP. Reduce the DPS.

Also, I still would like clarifications on the Acute Bomb.
Once the acute bomb has been put.. It will last for 25 second only.
Does this refer to the blast lasting for 25 seconds after all 3 bombs are placed, or that each individual 'bomblet' stays on the field for up to 25 seconds?
If it's the latter, is the blast a one-shot blast like the Nitronome or is it applying damage over time for a short duration of time?

Please note that the Acute Bomb has it's limited range.
Limited could mean being 2 squares apart or 20 squares apart. Be specific.