I like the charm of this game. The setting, the enemy designs and the goofy "dang" once you die.
That being said, this game would benefit a lot from mouse controls and then just having the crosshair shake about until it steadies (which happens if you don't move the mouse) and the time it takes for that to happen is then dependent on the age.
Still, cool concept that could be made into a really cool game with the right control scheme.