Fun game and it worked fine for me in the browser. I just made it to 32, though (I like swimming too much xD).
Not sure if it was intended, but you can move blocks while standing on them, or jump and move the blue blocks up. Also, jumping under an obstacle feels a bit weird, because the character kind of floats in the air for a while. But those are small points! All in all a great contribution, good job :)