Game is hard, but I managed to beat it. I'd suggest tweaking the acceleration, cause when you need tiny gentle movements it feels like your rocket zooms out of control. And add an instant restart on a key press, cause seeing your rocket explode for 20-th time is not fun at all. 

Also, everything is massive, making you feel claustrophobic, but as far as I understand, that's the point.

Making small asteroids pushable and letting you use them to dispose of enemies is a neat addition to the lunar lander formula.