#1 Cube World
Cube World is kind of what you’d get if you took the gameplay and combat mechanics of The Legend of Zelda and dropped it into the world of Minecraft. Add exploration, boss monsters, and set the whole thing in voxels, and you’ve got Cubeworld.
The developers have no plans to add mining or digging, but the game fully supports construction, and there are plans to implement a crafting system that will allow players to craft weapons and armor from loot dropped by monsters.
Like Minecraft, Terraria, and just about every other game on this list (with the exception of Media Molecule’s LBP2) Cube World began as a small project, but will undoubtedly become a game as big as Minecraft.