would be nice if the view was slightly 'larger' so you could see a larger area around your character.
would be nice to have an auto fire if you hold down the button - or just have auto fire all the time... there is currently no reason to not be firing in the game (if you have a button make sure there is a reason not to be doing it)
no refire delay, so fire rate is completely dependent on how fast the player can mash the button :(