Personally, the game would be way better without the wheel mechanic. The RNG was frustrating and often gave me any creature except for the one I needed to progress (I have "let's go gambling!" level of luck).

Something that I think would fix this while keeping with the theme would to have a similar system to Tetris: instead of the wheel being completely random, instead you have a bag of possible outcomes. Each time you spin, you take a random creature from the bag, and remove it from it. This way, the creature won't be in the bag when you next spin the wheel, which means you are guaranteed to get the creature you need in under 4 spins. (just remember to repopulate the bag once it's empty.)

Also, there are problems with keyboard ghosting in the piano. My keyboard can't have one of the arrow keys and both Z and X pressed at the same time, so I had to pull up the onscreen keyboard to do it. Just keep keyboard ghosting in mind when doing stuff that requires multiple keys pressed at the same time.

These were my only real gripes with the game. Besides that I enjoyed the sounds, and the visual style is neat! I also like the idea of you playing different creatures that affect the world in different ways, that allow future creatures to progress. I just think that's neat, and wish the execution was better.

I don't mean to make you feel bad or anything, I just want this game to be better, because I thought it was really interesting. I want to see your future projects! :3