Some critique and suggestions:
This game is all about aiming far away, but presents no options to know what you're aiming at (or through) outside of the map screen, so you end up playing on the tiny map instead of in the game space. Some hint arrows (Planet 100 km in this direction!) at the edge of the screen would be a huge improvement, as would a dynamic camera.
The asteroids are major killjoys. They are random and generally end your game outright because you have so little acceleration without a planet. Hitting one engages "slow, boring death mode" as punishment for something unforeseeable and unavoidable. I'd also recommend you give the player "sail" steering that has increased authority at speed. The constant-thrust controls mean that steering is effectively useless during a fling.