This game is purely soleless (or however the heck you spell it). When this came out on Steam, Minecraft had already been out for some years, and has been heavily updated and can be heavily modded, while this game has a severe lack of content (which is a terrible flaw for this type of game), very minor updates and cannot be modded. On top of that, this game costed $0.99 on Xbox 360 before it was discontinued, so why the heck do I have to pay $4.99 for it now, especially considering this game is a sad PC port. Plus, the co-op mode has no in-game chat system whatsoever.
Minecraft's Main Focus (in my opinion):
Mining and crafting is the main point, and once you become an unstoppable warlord or whatever with all the best swords, armor, enchantments, etc., there are countless things you can still do afterwards. (someone was actually able to make a fully functionable computer with a crap ton of redstone)
CastleMinerZ's Main Focus (in my opinion):
This Minecraft clone has a heavy emphasis on survival, but there's like only 5 different enemies or something like that, and once you've got the best guns and a crap ton of ammo, you're done! There's no point to keep playing because there's nothing else entertaining to do afterwards.
At Its Best: Crap (seriously, this game is that bad)
At Its Worst: Garbage