Very fun, for such a simple concept. Basically, you have to stop these knights from killing the little king by kicking their ladders down and stomping on their heads when they manage to climb up to the wall. It's as simple as they come, but it's quite fun.

Like the arcade classics, instead of there being a defined ending, this game just keeps getting harder and harder until it breaks you. It's pretty hectic, as the more you progress, the faster the enemies come at you. There are powerups to help you out, and believe me, you're gonna need them.

One thing I'd add to this game would be online leaderboards. In the Internet age, there's no good reason not to include one on an endless game.