I will play this game more and give it a full review, but I will say these things for now.
The jump physics are functional, but I think they can be honed more to look more like Canabalt Classic by Finji.
I also encountered an error from the page and then the game froze. Something about being out of bounds.
The time effect when you change is a little confusing and could use a video tutorial popup inside the game. This would help players like me who don't get everything right away.
I would also LOVE to see a storyline for this game.
I am aware that this is in the prototype phase however, it's good to get these ideas and critiques early on in my opinion.