I've been trying to find a really fun flash game I used to play but haven't had any luck. Robots (maybe alien robots) are trying to destroy the human city and you are defending it by shooting them. They are trying to penetrate a vault door or something. They look like sentinels from the Matrix movies. Some of them are the octopus looking ones, some have drill tips to drill thru the door, and some shoot saw blades. Your character shoots them and collects the scraps to build better guns and turrets. If you know the name of it please help me. Thanks!