The jumping doesn't really work... If I hold down W, it auto double jumps for me, sometimes I can cling to walls, and then when I wall jump it gets stuck in the jumping animation.
I also can't change direction mid-air, making some jumps almost impossible to land, aaand, there just aren't any checkpoints. I probably would still be playing if I hadn't to go back all the way.
It's a good try, and the game could be good, but there just are too many problems that need fixing.