I really like the controls of the slime! and how he can charge up to higher jumps and wall bounce, but it was really hard to control... a lot of the time when I was trying to make big jumps it didn't activate since I left the down button too early, so maybe adding a small time frame in which you can still activate the jump after leaving the down button would help, also, the wall jumps felt really small compared to the jumps the slime managed to make, so adjusting them would help too.
but good job overall!