In general nice, well done so far!
I'll add a +1 to the comment of @Cam. Sometimes jumping feels kind of off. When i move towards an edge and jump off i often just drop off without a jump since i apparently did not press the key early enough. I guess though that is an issue since the ground or character collider is not really a rectangle? ;) Kind of frustrating at times.
Other then that walls seem to be a bit sticky, would probably be more fun if i did not get stuck on edges and could instead "slide the last 2 pixels upwards".
Keep up the good work.