You are the monster. You've landed on Earth with one goal in mind: enslave humanity. Luckily, through millenia of superior gene manipulation, when you merely touch a lower life form, you immediately start the conversion process, turning them green and letting you proceed to the next level Tweet @zambini845
Convert every NPC. But don't get caught: You aren't bulletproof. Merely walk up behind someone and touch them to convert.
WASD - Movement
On slower machines, the end-level logic might appear to freeze. I used Tweenjs for the transitions, and that seems to not behave well sometimes. I tested this in Chrome on Windows7 on an ASUS netbook, and everything ran as expected except for the level-ending gui.