The graphics are pretty nice and I like how the slimes behave like actual bouncy objects. I'm pretty impressed you got the bounce physics working, those usually aren't easy to code. The puzzles themselves are very creative and really make the most out of the split ability.
Controls are pretty finnicky to use, especially when moving horizontally. I noticed that when you press the left or right keys you do a little jump, which I would prefer without. I also would've liked to see more levels. There's a lot of potential in managing your slime balls with your movement, so it would've been nice to see more levels that take advantage of that.
Great game overall, I enjoyed playing through it!