First off, thanks for the feedback!
I can see now that the wasd controls were a bit imprecise. My one play tester also opted to just use the mouse, which should’ve been a sign lol.
I definitely understand what you mean by some mechanics not being explained well enough, I thought about adding a level that explained key-coins a bit better, but because I made the game I thought that it’d be easy to figure out, which obviously wasn’t the case.
I also thought that the level that forced you to fall before you could reach the end would’ve taught the coin dropping mechanic, but I guess some text wouldn’t have hurt.
I don’t know exactly what you mean by having it so when you hold down longer you create a bigger blast as it’s tied to rapid fire mechanic, but I could see a secondary burst option tied to right click making interesting gameplay.
As for the difficulty curve, I tried my best to smooth it out but I only had one play tester and by the end they’d also mastered it so they couldn’t give good feedback about it, but if I ever make an enhanced version of this game I’ll definitely try to implement this and all other feedback you’ve provided.
Lastly, thank you for taking the time to play my game and give detailed feedback even though it isn’t the prettiest or most complex game in the jam. Thanks for playing!