Here's my 5 suggestions;
First, take a look to mixmaster and make it fair.
Second, fix the bugs commonly used in specific maps.
Third, add massive raid battles with many players.
Fourth, add some diversity between knights for their play style.
Fifth, more end game content "without creepers ofcourse because they are so annoying... ".

What would be your 5 suggestions to future of SK, please share your ideas in below! :)

Skill expression is a defining factor in the strength of guns in spiral knights. Magnus charges depend on knockback manipulation. Tortogun charges depend on knockback and usage of the invisible projectile, and alchemers depend on angles. Autoguns benefit from close range and flinch timing, and pulsars depend upon where its used and how frequently. Two guns lack any major way to tell apart a good player and a not so good player: mixers and catalyzers. A way in which skill can be expressed when using these guns can attract more people to practicing more engaging and expansive playstyles.

You know that mission? The daily one where you trade in like 5 materials and get some prestige?

Make it require 10 to 100 times the amount of materials, depending on what they are..
BUT
Let players do it over and over again, for one entire week..
AND
Give the player 1-5K crowns every time they do it..

but...
Why?

I've been a player of spiral knights since the golden days of mist energy and no fire crystals, and I've absolutely loved playing the game. The missions and characters were all unique dynamics, but in past years there hasn't been a move towards game progress. With that in mind, I'd like to suggest a couple of things. First, new pets.

As we know it, Spiral Knights has no use for the green or blue minerals, and as such they're just pretty things to look at in the arcade. What if we had a couple of exclusive pets that were fit to those minerals?

The block in the Vaults that reflects damage is stupid. I was running Dark Retriution and was doing my first vault ever. I dropped a dark retribution and suddenly I just started dying. There was nothing I could do, I just died. I had to spark, and luckily had a friend explain what happened or i would probably have died again trying to fight the enemies in that room.

Why? Because we spend a lot of time getting to the deeper depths of arcade, but there's not much reward for it. We could have gotten MORE profit by simply running some Firestorm Citadel and other boss missions. Arcade is fun, but it needs to be a bit more rewarding. I suggest having a bonus reward for reaching D7, D17, and D28. As well a increasing the general crown payout of every arcade level. Nowadays the average T1 gives 2-4k T2 gives 6-7k. The average T3 gives 8-10k.

The new crown payouts should be around
T1: 5-6k
T2: 10-12k
T3: 13-18k

Hello.
At this time i have to remove one of my friends to add new knight. I came to situation when I remember most of knights in my friend list and i dont want to remove them even if they dont play some time.
Maybe friends limit can increase with time? For example +25 slots/year.

.

I don't like spam in my living room !

It's bugged and currently does 30% less damage than biohazards neutrals, even thouh neutralizer has no status. Neutralizer should be doing more damage than biohazards neutrals.