Humans vs Robots (Java game, in early development)

Well, this is the result of four hours of work. It ain't seem like much, but it is about 200 lines of code, not counting white space.

I'm making it in Java.

The collision engine is 100% custom. It isn't very long (40 lines spread out between two classes), but it is efficient.

It is going to be a puzzle game where you have to destroy the robots (which are not in this video, they are not finished yet) while keeping the human alive. The robots follow you around, and you can kill them by crashing them into walls or each other.

It is pretty much a remake of a game that comes on Ubuntu Linux by default.