It cost a dollar and its fun to play.
Z0MBIES!!1 Is a twin stick shooter for up to four local players that really must be experienced to understand. The enemy spawns are tied in with the rock song in the background which is, in turn, about the game. I would call it a work of art, but that would undermine how much fun it is. Every bit of it is great and if you download the demo it will likely to convince you to drop the 80 msp ($1) for the game.