Good game and certainly worth it for $10. Have spent copious amounts of time playing this game in co-op with the usual folks

Building your little hut initially from bits of wood you chopped down while having zombies kick at your door at night, later expanding into some large mansion build from crafted bricks created from dug ore and blocks. Many options of weapons and armor, as well as many forms of decorations. One is also not limited to the usual zombie, spider, creeper and skeleton with this.
I quite agree that this is a genre of it's own, there are so many variables that can be changed. Yes, similar to Minecraft, a copy? No. However, it started getting a little stale after a solid 20 hours. But nonetheless, not a bad game for the price.