Here’s a playable demo of what I’ve made today: http://dl.dropboxusercontent.com/u/23027068/ld48_day1/index.html

Controls: Minimalistic! Space and only space. Tap to move, hold to rotate, hold longer to shoot. Kill the “zombies” and avoid “lava”.

Still not sure if this has any fun potential, the controls are the only original idea, and they’re a bit frustrating.