A good game with plenty of challenging levels, although I found getting a hang of the controls a bit more difficult. Still, it isn't too bad after you get used to controlling the craft, then you start to appreciate the game's physics and mechanics. The premise of this game is fairly original without being bland or too out of the ordinary: collecting a key and then hoofing it back to the start has been done before, but never in space. The art direction and graphics are well drawn, as are the special effects and animations (which were rather minimal in this case).
The only thing I would think to improve about this game is using the key to accelerate and point the ship in certain directions, as well as adding an air-brake to allow for precision steering around tricky corners and obstacles. Maybe putting in a timer before the gates close again or before the level ends in failure would be a nice touch if you ever decide to make a sequel.