Use arrows or wasd to move, and space bar to punch. You lose 100 score if you die, though you can't go below 0 score. You can hold space to punch at the max rate. Press = and shift at the same time to enter edit mode, and [ and ] while in edit mode to switch tiles. Press - to die if you get stuck. Punching does Area of Effect damage, so you can punch several bad guys at once.
Unfinished, though I'm declaring it finished anyway.