First and foremost: collision.
Collision really needs some work. I got stuck inside object some times. I even got softlocked inside a moving platform once. So it would need some more work.
And on the same topic: consistency.
The trampolines aren't consistent (which they should be). If you jump and land on a trampoline you get that extra second jump, but if you walk onto it, you don't. This is strange and does not make sense.
However the controls felt nice - except when you get stuck inside something - it was responsive. The graphics looked nice, and the artstyle was consistent.
The first level was a nice first level, wasn't too hard. But the 2nd and 3rd level didn't feel any different.
Also, I don't see a reason to use the crouch (or hide) any time. Maybe you could add some more functionality to it? Maybe harder enemies would do the trick. Since as for right now, there weren't really use cases for it.
Overall it was a decent platformer game, especially for a jam game. I had fun playing it.