I put here my comments about the game, since the console gives me the error after the form submission.
I didn't manage to end the first level, after the first checkpoint since many times happened that I triggered chrome shortcuts (like CTRL+D during the movement to see where to put the block). I found the block placement a little bit to fast in disappearing and placing where the player is oriented is not too intuitive, in particular, when the player looks forward, the block will be placed some pixel higher than the previous one, creating a sort of stair instead of a bridge.
Player movements are ok, I'll just reduce the speed. Using the arrow keys are not ideal (to me). If you need, I can post there the gameplay