TOTALLY AWESOME!!!
This was great fun!
The only areas for improvement I saw:
1) The "exciting" music when you're working on the rocket cargo is looped too short so it starts to become tiring to listen to. Slower paced music can have a short loop and not get tiring but when the music is more intense short loops don't work so well.
2) A couple times my tool got stuck in the walls and I had to reset. The physics engine seemed to be mostly good but slightly glitchy.
3) It would have been great to be able to hold down 'shift' to use less powerful thrusters when you want to do slight movements rather than shooting all over the screen. A lot of times I knew what to do but the controls got in the way because the thrusters were too powerful.
Great game overall!! 5/5!