I Has Demo: I Am Weapon
I Am Weapon is a tower defence game set in the world of bad dreams. Developers Sigma Team, previously of the Alien Shooter and Zombie Shooter games, explain: "The world of nightmares is mysterious and amazing, it scares and fascinates at the same time. The laws of real world are not valid in here." Fortunately the rules of tower defence remain much the same, although in this you seem to play a dude with a minigun. You can sample that particular dreamworld via a demo which can be downloaded here. The game features - and I have to quote this verbatim - "all types of infuriated clowns you could ever imagine! Their laugh makes you go crazy!"
I haven't played it, but I watched the trailer, which is below. That's a lot of blood on that chessboard.