The jump goes really high, and it can be a bit hard to tell where you'll land at the end, and the wall jumping can be abused to cheese the levels. Besides that, though, this is a solid game with an interesting concept. The time-slow-down mechanic was pretty helpful!

Interesting ideas here; the way the powerup works feels really unique and nice to play with. The only issue I had was that your jump seems huge. On my first go, I flew across the whole level and ended up falling into the void for the rest of eternity. Besides that though (and lets be honest, I'm most at home falling through the void for all of eternity), pretty fun game with a cool mechanic.

enemies not being affected by time slow is a super cool idea!  Some advice: I'd recommend looking into tilemaps in the future rather than just using a stretched out sprite.