The level design seems good and I had some fun going through the levels.
Unfortunately, the graphics and music could use a lot more work.
The worst part is the glitches. Stopping while moving, clipping through stuff, and a certain glitch at Act 3 -3. where you spawn outside of the world, leading you to either have to do the whole game again, or press SHIFT to bring up the credits and instantly unlock a level select. I don't want to have to do that to win.
You have lots of potential with Smash Ringtail Cat and you seem enthusiastic with what you're doing! Keep it up!