Got it for $3 on Steam during Halloween sale, been playing with art.
It's a top-down arena zombie shooter and it's pretty cool. It's very small and low on actual content, and all you basically do is survive against a fucking huge horde of zombies, but remember: only $3.
That said, there's a lot of variety in how you kill the zombies. There are a lot of unique weapons, and probably fifty almost completely unique perks. There are things like sawblades that launch from you every thirty seconds, better accuracy, damage to enemies in a radius around you, penis enlargement, etc etc etc. It's very addictive. I'm only able to play in short bursts, like in Minecraft or Blacklight, but art keeps pressuring me to play more, so it works on him at least.
It's pretty fun, definitely worth the $3, or whatever that transliterates to in your countries, otherworldly friends.