Wow! Seriously fun game. A little bit of a learning curve but the I got totally hooked. Others are mentioning difficulty -- I don't think it's too much of an issue. I think maybe there could be a kind of handicap situation where each death gives a nominal stat increase, just so that any amount of playtime slowly raises the skill floor, but I personally enjoyed the challenge and didn't mind the repeated attempts at all, since the controls became really intuitive. Perhaps you could make each death seem a little less menu-y and a bit more 'instant respawn' to keep the flow of the game going -- current death pop-up could be a temporary HUD pop-up as a new ship spawns in right away.
Also -- holy programming. I think starting to even think about how to program it might induce a migraine. Watching the trajectory just... be correct... was crazy. Also, I'm not sure what, but I feel like you should do something when all settings of thrust will result in a crash -- it's a very particular kinda 'oh shit' feeling that I think you should play up, haha.
I found myself a little disappointed there wasn't more to play once I beat the final level! Remarkable entry, full marks from me, bravo.