Pretty fun! I liked the size of the map and the ability to slide against wall. The jumping mechanic didn't really work for me, but I see from other comments you've replied to that it might be something with WebGL causing this.
I also noticed that the hitbox for the spikes was very generous, so could find a bunch of corners to stand on which made some platforming that probably were intended to be hard a bit easier. I think with my games too big hitboxes, and your games a bit to small ones we should try and aim for somewhere in the middle for whatever next game we make ;)
Good job!