It was a cool game overall but I think some power ups would be alot better, or earning money to buy powerups.
Loved the game, space shooters is something I hold very dearly. You've done a great job on both graphics and gameplay.
If I could've asked for anything more it would've been more bosses with different strategies to beat them.
More weapon upgrades (can never be too few).
Reduce the amount of armor upgrades (there were far too many)
Really liked the game
Only thing was lev 1 seemed a bit too long in comparison to lev 2 but all in all a great play
Very like some old shooter (1980~) with nice graphic.
But make some changes:
Make player fire stronger weapons( or bomber)
Make enemy HP lesser (It took me >5 mins to finish 2 space ship and the warp gate)
make more enemy fire pattern
Power-ups not just + HP
Some Charge attack may make game easier
some of the enimies got a little annoying but good!and i never figured out how you got new wepons....