I can't believe the Art is made from scratch, everything looks amazing, from the character model and animations all the way to the background and the little parallax effect at the end.
The controls are really cool, the fact that it's not just a "jump and run" with jumping and running but also sliding and walljumps is great.
My only pain is that while it does fit the theme as as a "Die and Retry" game, it is unfortunately the first idea people get so I can't give a full mark on creativity here, but maybe that's just me.
All in all, it's still a cool game, good job!