A good gameplay, but kinda plain
I don't know if it's because after reading some bad review down here i expected something much worse, but i really liked this game! I usually can't get myself to play more than a level or two of any other shooter here, but for the first time in years i stopped and played one more than once. I think it's a good game. As others have said, bosses have too much health, the enemies are kinda characterless and the game is very classic, but i seriously thought the gameplay was pretty balanced, at least for the "softcore" players like me. I didn't get killed by random supersonic waves of unpredictable enemies, or while trying to reach some spinning powerup in the middle of them, but just when i failed at predict the enemies' patterns of attack. For example, on the third boss, its big size made up for the large cone of its attacks. I'd really love it if you just added an intro or some text as intermission.
I see people down here pointed out the majority of possible improvements, but, if you make another shooter, i hope you keep at least the good idea of gameplay you had in this one.
Oh and i liked not having to redo the whole level when a boss got me and also that the levels weren't too long. I'm going to wait for your next submission in the Shooters section...