Really fun! Controlling the ship was a blast and I enjoyed pinballing off of walls as I lost control. It's pretty simple in terms of presentation, and the two-tone cave system is kind of boring to look at. It would have been nice to have a little extra color or details in the rock. The sound works is really excellent in this one--you have awesome effects that are very impactful, and your wife's music is too. The final task of getting the key was really fun, having to use your speed and force through the barrier. Very rewarding once you figure it out.
My only criticisms are that your text sound effect is a bit too loud, and that the rocket speed/velocity information looks more like debugging info than a UI element. Though, I like the idea of it a lot. Good work!