You have two mouse buttons, no way have you used them for something this awesome.

If you play this game, you'll feel like you knew how to kung fu your entire life.

Basically, you can't move, and people come from both sides, left and right. When they get close enough, you can use your mouse buttons to hit them.

If you think that's all, you have no idea. Later on, weapons kick in, punching obstacles to hit enemies, bosses, combo zones where you have to fight one guy who dodges a lot, etc... I really only saw the video above, which what I'm basing my description on.

You have to try this out, it's beyond fun.