I'm a HUGE fan of slimes, so I really enjoy that aspect, and the animations are really cute...and while the gameplay concept is pretty cool, the controls aren't tight enough, and I spent more time missing ledges than progressing. It's fine to make it challenging, but it needs to be satisfying with the mechanics to keep more people invested.
Just for example, in Jump King, the mechanic of jumping is silly and unique, so it works to be frustrating, but if it's just standard jumping, even with the powers, idk...it didn't catch my attention for long. Maybe I'm just different, haha.
You definitely have something, just a little more polish and maybe a slimetastic hook needed.