This is a really good game, but an amazingly awesome game for 72 hours!
Like the others have said, it would be really great if it had any kind of upgrade, different stages or even "hp" for the girl.
Also, I've found some bugs. The character can disappear if you keep walking to the lower right border of the screen. You freeze in midair sometimes if you shoot when you're falling. Monsters die by arrows in the ground.
Anyway, the concept is incredible. You could create an outstanding game with it! Like a survivor/defense game with really hard levels and money drop for upgrades.
Well! Good work! Looking foward to see a modified and more complete version of this game.