A good game that could have been a great game.
GOOD:
The graphics and music were appealing.
The ability to use different weaponry was good.
I enjoyed the opening animations, especially the bit with the bird.
BAD:
The sprite to screen ratio was awful. It meant a whole lot of close-combat/hovering style gameplay.
No extra ammo for secondary weapons, which means you have to die just to try them out again.
The bit with no guns was annoying, too long and unnecessary.
The most challenging part fighting the boss was whether I could defeat him befroe I fell asleep. Very tedious.
At one point, I was stuck on the left side of the screen for 5 secs after being shot at.
A petty quip: When a new Wave starts, why do turrets appear out of nowhere?