Loved it! Simple gameplay, but o so addicting :). And maybe you could put in some other music, to choose from maybe, something with more speed. And love how the game gets very hard after lvl 4 :D
The ships are just plain stupid. Going around a whole planet when going the otherside round shorter is. What's that all about? And map nav is quite annoying. Zoom out would be very nice too, and maybe colonizing other planets?
Regen perk is overpowered, like really overpowered. And I liked the smaller ship perk too, but again, maybe it makes you a bit too small. Still, lovely game and enjoyed playing it. Was a bit sad when the boss came though, the game finally started to become a bit challenging... O, and in the end (with like a lot, a lot enemies on the screen, before the boss), bombs actually make more money then they cost. Maybe bombs should cost more if you buy more of them (so first one 300, second one 350 etc.)
Again: lovely game!