Neat game concept. Also nice space feel with the music. Unfortunately I had the same problem as Wandering Peak below. Tried on Firefox and Safari on Mac. I had an external mouse, but also tried removing that and using only the trackpad, but the behaviour was the same.
Tried moving the mouse around, and there is some response, but mostly the game seems to think the mouse is off to the left somewhere, and maybe little to the top. What are the controls for moving forward anyway?
Also I don't know if this is related, but when I first hit run game, it opens a new window in which the game screen occupies only the lower left part like below: