game doesn't work at all

Edit: Errors fixed.

Still, I think the game is too short. It's one short level, and still not quite polished.
Some feedback:
– going left makes you fall endlessly (and reload the page)
– wood blocks have no collision
– there's no need to add the first checkpoint so close – just set the first save point to your initial position
– running out of lives also makes you reload the page
– dying to enemies resets you back instantly; usually, it's good to give at least a brief delay (so the player knows what happened)
– same with completing the level
– the music loop is too short; in a longer level, it would probably get annoying soon

Pressing space did nothing?
EDIT: After playing the "fixed version" this still shouldn't have been uploaded. Needs more development. This is hardly a game.