Initial thoughts (I'll update after more gameplay)

The graphics and the mechanics are awesome! The opening screens are very inviting!  The OSD is simple and easy to understand!

(After Gameplay)

I love the feeling of the massive explosions you get when you launch all 6 missiles to people in "the back" (kudos on having the real 3d physics to recognize a ship which the missile collides with, even when it is not your initial target)

Difficulty curve could stand to be a little steeper, but i like how easy it starts at.  

I know feature-rich content gets to be a slippery slope, but using some economy of some sort to offer that multiple missile option (or any other buffs, like "more shield gain per click") would make the game a  positively addicting "infinity shooter" (which is the category this fits best into)

In short, awesome graphics, simple yet effective UI (not OSD...  i wasn't thinking earlier) and good base for a great infinity game