Nice game, I fell a bit anxious as the levels were passing and the song seemed to be faster. Dashing isn't always working, or at least it's not clear when it should work or not. The trick is to combine space and arrow up multiple times to jump very high or do multiple jumps, and it adds up when snapping to a wall :D
A quite small issue I caught: beware about sprite atles to get rid of blank lines between tiles. It appeasr seldom, you must jump multiple times and reach the ground so you see it sometimes.
Well done!! :)