Features:
~ Awesome Graphics made by me!
~ Awesome Sounds made by me!
~ Awesome soundtrack made by me!
~ Awesome Gameplay made by me! (is there a pattern here?)
~ Glass shatter effect that makes the game worthwhile!
~ Full game including a final boss!
~ Two secret hats that do awesome secret things! (gotta catch them all!)
Controls:
z - jump
x - shoot
arrows - move
Notes:
~ Santa hat makes your damage 3X more!
~ whirlygig hat makes you fly!
~ Enemies have 6 hp
~ Boss has 40 hp (if you have problems killing him find one of the hats! And save the health powerup for later in the fight)
~ Health powerups heal you all the way up
~ You have 10 hp the screen bloodyness determines your health (more blood means your close to dieing!)
~ Computer 3 opens the door to the boss!
~ The data file for this game is only 656 kb but the exe is 1.71 mb?!

EDIT: Forgot Linux version, thanks bee!