Made it to level 6 and then the game crashed when I crashed into an enemy ship. I really liked the heat seeking weapon and the ability to assemble the ship. One thing I had a hard time with was seeing the momentum of the ship properly, the only thing that gave you an indication of your speed etc. was the thruster trail and distance to enemies, but since it's in orbit of a planet maybe the planet could rotate as you move around to give you a better feeling of the ship's momentum? just a suggestion.
It's a good game and could be even better with some more polish, good job!