I like the senseless killing bit, graphics need a bit of work but it's your first game and it's good for your first. Enemies need to move and fire back, including the helicopter. You need to be able to die. It wasn't bad for your fist game. Hope the 2nd one is improved.
 "The Stair Well Massacre"){kind=icon}
 "Meat Boy"){kind=icon}
 "Heavy Weapons"){kind=icon}
 "Monster Master"){kind=icon}
 "Streamline"){kind=icon}