but the developer should limit the shots. otherwise this is one big fireball! :) this can't be what the game is about... limit the shots and it'll be fun!
next: after running the app, the keyboard reacts differently than before.. i can't press and hold a key (well, of course i can, but the mac only takes one keystroke)! in fact, it changes the preferences of the "Delay Until Repeat" slider in the "System Preferences -> Keyboard & Mouse -> Keyboard" pane to "Off".
If someone does not find this out, the bug could be very annoying, as only a reboot of the system might help...