For starters: I really liked the intro! :)
The game looks nice and feels good (the death slowdown / effect, which I have seen many times, looks so nice!!).
Also good job on the mechanics for melting the asteroids, and the IA =p
But the first wave was too hard to beat for me (maybe i chose the wrong upgrades at the beginning?). Also it would be good to have an explanation of the upgrades because I felt a bit lost when having to choose (but maybe I missed something?).
Nice entry!