I believe the game itself does not have much content in general... its an incredibly small game compared to other games of this type....
What could be improved is:

-A better storyline. Players can tell what the game is about from the first 2 missions

-More Boss Fights. The game has very few bosses and therefore is not enjoyable with only 4 bosses in it (prestige not included)

I'm not being "that guy" here, I'm completely happy that the Gunner Update is out and I'm not in any possible way trying to be rude but it seems a bit... overdone to some extent that the new gunner armor completely doubles the existing armor just for very slight differences.

This isn't really a problem on one side of things but it's also very... misleading on how much was added. This is especially prompt for plenty of people who want to craft everything or even gunners themselves whom want to have access to a lot of these variants. In the long-haul, price comes into play here.

Mayhaps it had evaded the developers. Heretofore, one could adorn a dapper combo and put on a grand display of gentlehood. Henceforth, the introduction of the monocle has invariably generated a most unsettling juxtaposition: How best to display one's gentlehood?

Shall the community raise forth and lobby for the developers to bring about the Dandy Combo, enabling maximum gentlemaniless to exude from our precious knighthood? Perhaps a gem topped cane cosmetic variant of the flourish line as well?

Just like the title, all I say is remove the Hall of Heroes recipes from Basil.
Mainly because there are thirty+ Basil recipes, adding in all of the Hall of Heroes recipes makes it impossible to get what you need.
Yes, I know this screws Basil runs but, please, make this one thing easier on the players. Please.

This idea came from some coliseum forumers. And I think, it would really not be hard to do.

There is an obvious lack of players in pvp in spiral knights. Most of the players from the game are interested in Pve, but the thing is that some are not even aware of the coliseum thing or they simply never paid attention to it.

Being a european player, I can see that there is almost no lockdown game during the day , even in the week-ends. There used to be some t2 lockdown but there isn't any longer and the t3 games are only in the evening. I think the t1 never existed.

I think that the FSC should have more enemies that fit within its theme, like more fiends and undeads rather than wolvers, jellies and puppies. I know that some of those enemies are there to make things easier for us and then they are replaced with stronger variations in the shadows lair (i.e red rovers replaced by fire howlitzers)

Slimes should be replaced by pepperKats.
Beast should be replaced by Devilites and replace some zombies in some rooms.
In the 1st spike room at depth 26 they should add some gorgos

Well the forge is a great idea, but I have found it makes heat multipliers useless, in addition to making it extremely hard to level up equipment, especially when doing many consecutive missions without the forge available. This is just a suggestion but I think the forge would be better if it was in addition to heat earning instead of the sole way of leveling up. An example would be; I want to level up a weapon but don't want to play so I just use the forge to finish the job, so I can play later with a more powerful weapon.

Using data from the past tortodrone events, it seems as though the event comes out once every 5 months. This means that it should come either this month or in January. There has always been new content that comes with the event (1st was shields, 2nd was Guns). I really like the shields and guns and can see that OOO put a respectable amount of effort into them, making them truly unique, with all their special abilities (big bash, crystal walls).

So in the next event, I suggest that we get tortodrone armor (not helmet, because that would look ugly on a knight).

Dear OOO, Thank you for a nice game.
I have a suggestion, please. Would you consider letting players at least sell their crystals to a vendor at a star-material price. (I don't need 7,000 Shining Fire Crystals.--and counting.)
Thank you.

Currently player can see nice models only on high settings, but high settings also brings a lot of heavy graphical effects which sometimes reduce performance (on laptops mostly). I would like to suggest an optional checkbox for high res item models. So player could be able to see yummy models even on low settings.

Checkbox should bring only models, not effects.
Cheers.