I tried this game, here are my observations.
First of all, I assume that more animations will be added to the game. Then, in the 2nd area, when you get up and through the 2 wall jumps at the beginning, the area becomes way too bright and it' really hard to see. I know there isn't much to the visuals yet but I still found area compeeling!
My biggest annoyance would be with the double jump/multiple jump. It seems that it is not always registered. It feels like a bug. It also looks like speed doesn't matter that much when jumping long distance which feels strange. Otherwise, fun and fast paced.