I can't believe I haven't commented on this yet (except for once complaining that it didn't work... I then ran it on my laptop, where it did work). I only got around to playing it for an extended period yesterday evening, though.
What stands out to my perhaps the most is that the movement feels so
right. I can't put my finger on it, but the way you accelerate, combined with the very dynamic movement of the cockpit itself, gives movement in this game an extremely visceral, satisfying component. Very well done.
The other highlight in this game for me are the environments. You must have had a lot of fun designing those, eh?
These are fantastic, varied locations, some feeling high-tech, some very alien. I had quite a bit of fun exploring, and the atmosphere is great. Somehow this game is like a sci-fi version of Magic Carpet. That said, in that level MisterX mentioned, I did find the two keys, but then I couldn't figure out how to proceed further, so I got stuck there. But it's a minor annoyance, I guess I would have found it eventually, but there were so many more games to judge...
In my opinion it doesn't feel like a complete game yet. Something to tie it all together, like some narrative (which could well lean towards the abstract, as the levels do), some sense of purpose. Also something as mundane as a more fleshed-out main menu with a list of levels to choose etcetera would go some way towards making it feel more complete, I think.
But it doesn't matter, it's still one of my favorite entries, and you get my vote.