I like the general idea of the game and especially the polish and execution of the game. The art also fits the the game really well., but it is not a game I would see my self enjoying more than a few runs. Maybe some sort of Rogue-like upgrades could be a way of keeping players engaged.
For one I would suggest to include a little tutorial and secondly I had a hard time to see whether ships actually saw the rock I was shining light on. I think some sort of visual feedback would help a lot.