I've played this game to what I presume is the end, because the game froze. I am a bit torn about this game because as many comments point out, the movement feels pretty good! Especially the last section feels good to perform. However the thing I am lacking the most here is clarity. Because the sprite of the player doesn't change, there are no particle effects and no sound effects it is pretty hard to tell what is going on often. I think getting feedback like sound/particles for when something important is going to- or is already happening is crucial! If you want to continue with this project please focus on making it clear when you jumped/the hitboxes on objects are/what powerup you acquired.
I think there is a good amount of things you did right but I there's also a lot that you can improve!