Nice! Well done on the effects, the feel was solid. Overall great job!
Two minor bits of feedback:
I played the game twice, once without reading the instructions and once with - I felt it actually didn't need as much explanation as was offered. The only thing I missed was the drag-to-aim.
Since the goal was to save as many evacuees as possible, it didn't seem that interesting of a decision to power down the rocket. Maybe it'd be cool to have to decide between turrets and shields instead?