There's a balance issue that you're rewarded for killing enemies, but they despawn if you finish the wave. So the player is basically punished for hitting the black hole.
This is impressive but the pacing is really off, presumably because gain isn't scaled well. There should be an exponent on gain as well as the player's size, so larger objects count for more.
E.g. you actually track the player's volume, and add objsize^3 volume whenever you eat something. (Probably with an added multiplier to keep things working.
Also going from city->island is a weird spot currently since there aren't many things you can eat. There should be edible things on some of the nearby islands.
So you need to have gotten 4 of one creature to be able to sell? It would be better to always let players sell so they can make the choices to progress.
It would be nice to be able to hide the touch controls. You should also make it clear that you can't use F on the things when your energy is empty, I thought something was broken because the prompt was there but didn't work. It can be difficult to enter 1-block gaps.
Adding commas or something to the number formatting would help with readability. It would also be nice to make affordable and fully bought upgrades look different.
The system for adding bumpers to your party is annoying. It should skip bumpers you have 0 of and instead of being the full list, being selectable by archetype first.
The roulette and copying and printing thing has two issues to it. One is balance-wise, but the BIG one is that it slows down the game when you have to wait through it every time especially when it prints a lot.
