Nice preview.
I have some tips for future improvements:
It will be more interesting, if asteroids can ricochet from hull (different angles/speed/size = different damage) and another asteroids, this enable asteroids to impact the ship sides. Very small fast asteroids can breach deeper in the hull.
Allow us steer ship, it allow us protect damaged side, dodge very big asteroids, etc.
Ship movement can be predefined in 2D space map (visibility depends on ship sensors and environment, so you dont see everything) like in this game (
http://www.androidtapp.com/flight-control/) so player don't need adjust flight path constantly and have time to micro crew.
Defend ship with point defense lasers (can destroy smaller asteroids, missiles) and heavy weaponry a tractor beams (alter asteroid course), shields.
2D map can be also used for combat, map can be very simple and user friendly, if you made something like this:
http://www.warfaresims.com/WarSimsWP/wp ... ngwei1.png, player clearly see range of sensor, weapons, multiple targets, etc.