A cool little learning project. The last level, while very janky, was very fun. I love the physics and momentum when wall jumping to the top. You should put texture on the walls to convey an even better sense of speed. I think I won the last level? But it's hard to tell since it just looped me to the beginning.
Some thoughts:
-The game feels zoomed in and claustrophobic. This leads the player to hit obstacles without being able to react to them easily.
-The music is WAY too loud by default, and there doesn't seem to be a way to turn it down in game.
-I don't know if this is true for all levels, but in the first one, if you go left, you fall off the stage completely and there's no way to reset. You could put a wall there so this doesn't happen, and add a menu that appears when pressing ESC that allows the player to restart the stage or quit.
-In the last level, you can actually go THROUGH walls, and although I touched enemies in that level several times, none of them could hurt me for some reason.
-There are some pointless spikes that are sandwiched so close between blocks the player can't actually reach them.
Hope this helps!