jesus christ this is buggy on chrome
I tried playing it on Chrome but I gave up. Every ten seconds or so it skips to the next level (usually when landing on a block but not always), when the character dies it often re-spawns below the level, or is embedded inside spikes, making progress impossible. Until it skips the level for no reason of course.
I'm giving you a 10 because of benefit of the doubt and all that, but I didn't actually get to play it.