Finally a super easy platformer, with not arrows keys, aswd and many other keys for switching weapons and attacking. No just 2 keys.
Like the mechanic where you bounce back upon hitting a wall!
Some frustration solving gameplay finetunes:
Make pressing (R) restart the level.
Make pressing (P) pause the game.
Some gameplay fun increasing finetunes:
Make it possible to jump again when you hit a wall, this feels like a possibility but isn't.
Make it possible to jump against a platform and use it as a wall, did this sometimes felt possible, but didn't bounce back.
Like how the shell becomes black when it dies.
All in all great job on this game.