Hey nice work, liked the simplistic aesthetic of the game. Wanted to make a couple comments on the game feel that I think would improve the experience a bit. 

I noticed when you jump into a wall you kind of glitch into them. You're probably not using Composite Collider 2D. I would look into it, it solves that issue. 

Also, the controls for the character make it so it's a little hard to maneuver. If you're making a game with platforming I would invest in making the movement system a bit nicer. 

Next, the second level was frustrating because if you pushed the circle up to the wall you were stuck, so I would maybe add some physics to the circle so you can push it off the wall. 

Lastly, I felt a bit lost on the puzzles, maybe some more visual indicators on what you're supposed to do would go a long way. Again, the visuals were pleasing and the puzzling seemed interesting. Good job!