The movement is extremaly glitchy for me in FireFox but works just fine in Chrome. Overall I love the game! Looks like polished and well-though I wouldn't guess it's a jam entry!
Bit too difficult for me but I'm just bad with this type of games.
Love the dash effect - so simple yet looks so cool!
You could add alternative jumping button (up) because it's more natural to some people (me) while space is to others (not me)
edit: hey! I beat it ^_^