This set consist of being a 2 weapon player so you don't have to buy the Weapon slot and you will be less killed or get hit by a monster by using this set.....
Spiral Demo - Volcanic Demo line
Defender - Aegis
Pulsar - Supernova
Fiery Vaporizer - Ash of Agni
Freezing Vaporizer - Shivermist Buster
Blast Bomb - Nitronome
The only item here that is both extremely valuable and expensive is Pulsar but as long as you got the 2 star it wont be a problem getting the recipes....
Purpose for each weapon:
Pulsar is used for ranged monsters like Gun pups so you wont get hit and its your main weapon
Fiery Vaporizer is your secondary weapon used when there's a lot of monsters chasing you and in close spaces
Freezing Vaporizer is your back-up if Fiery Vapo is unusable in a level and you use it to keep enemies still while you shoot them down with your friends ( keep in mind that some monsters are immune to fire)
Blast bomb is your muscle bomb or you could use it for defense on mobs when your stuck in close spaces and the high the stars it has the larger the damage and radius for the blast so its really essential to get this bomb first the than the first 2....
Your strategy is easy, you just stay away from your enemies all you do is shoot and lure (to your fiery and freezy traps) and hopefully you will die less and wont get hit too much....
This set requires a lot of skill and speed, remember that at all costs you must stay away from your enemies or well you die...
What do you do when you hit beasts or gremlins? They are immune to elemental, you would be better off having a Nitronome, and a Dark Briar Barrage for areas without constructs or jellies. No doubt they are good bombs, but that loadout can't be you're only loadout, and definitely not a starter loadout.
A better loadout would look something like this.
Volcanic
Aegis
Super Nova/Valiance or Leviathan
Nitronome
Volcanic for the same reasons you put it down there,
Aegis for being dirt cheap, although you will later want a GOwlite and a CoA
Polaris deals elemental, which will be resisted by some monsters,
combined with the fact that all your bombs are elemental and you are gonna have a bad time in tier 3 wolver lairs. (or gremlin areas)
The fact that this list doesn't include a nitro or DBB makes me sad :(, you should probably test out builds before you tell newbies that the build is good.