Very unique and cool concept. Lots of ways I can see this being expanded.
I liked the snapshot at the end. I think "infinite scrolling arcade" games should do this more often.
One thing that I disliked: The ship is almost always struggling against gravity. I'm holding down the booster constantly, and I often struggle to gain height. I think the game would be improved if gravity were turned down to the point that players only need to be boosting 50~80% of the time.