Great Game
This was a good game. It had a unique style of gameplay (as far as I know, I haven't played anything like it.) Although the graphics were simple, I really enjoyed the way you made a puzzle out of it.
There are some small adjustments that would make this game better though. First off, the controls for the ship seemed a bit unresponsive. I suggest making the ship move a little bit more when you hold down an arrow key. Also, after you complete a level, try to have it so that the game pauses and you don't have to hover the ship or manually pause the game to click on continue. I know it doesn't make a difference if you die after you complete a level, but it's not all that great when you die after every level... Also, you could try to make the game unpause after you press either an arrow key or wasd. That way it's easier to start a level and you don't have to press backspace all the time.
Overall, I'd say great game. Keep up the good work! :)