Hello, thanks for the feedback! I've been looking at your suggestions for improvement, and do have some responses to add some context, and some future plans for improvement:
So first of all the biggest issue in the game: The Gravity. I've actually been testing and re-testing the gravity of late, trying to come up with a gravity system that works well for Pouchie. The issue previously was that the gravity wasn't strong enough, and people were complaining about the game being too floaty over on Newgrounds. So now I have the opposite problem, lol. I'm going to keep trying to tweak the gravity until I have something that's a healthy middle ground. Changing the gravity also means I need to adjust Pouchie's jumpforce so that he doesn't jump past his set jump height. I'll use that opportunity to adjust the wall jumps.
When it comes to the suggestion of making sprites to indicate wall jumping: A friend of mine had actually offered to make all new sprites for Pouchie that would be better art quality than what I made, and so I've refrained from making extra sprites while waiting for the updated character sprite. That being said, since I don't know when those sprites will be ready, I might end up making those extra frames myself, in the current art style.
Coins to indicate safe fall zones: I do admit that I should better layout certain fall zones. I've fallen into the trap of overplaying my game, so I know where most of the danger zones are by heart that I instinctively avoid them. I will do more to indicate safer zones going forward.
Crys-Tortles being unkillable: The reason I made them resistant to the mallet was mainly that I wanted an enemy that Pouchie straight up can't damage, because it's shell is too powerful, forcing players to have strategize around avoiding direct confrontation with it. I still want to stand by that idea, but I may make a change in the future, that hitting them with the mallet will actually flip them over, and they'll become kickable like cannonballs.
Music: I agree with you that some of the music doesn't fit the aesthetic of the game. In fact, the main theme for the first seven levels has been placeholder music from the very start. It's been a challenge finding music that gives off cartoon showtune vibes while also matching the pixel platformer aesthetic of the game, and that song in particular has been one I've been eager to replace. I've tried making my own music, and in fact, all of the music for World 2 was made by myself. Hopefully in the future, I'll find music that better suits that section of the game.
I will continue to work on and improve Pouchie The Cat to make it the best version of itself. Thank you for the feedback!