I'm not going to say much about the game since the fan made trailer pretty much speaks for itself. I will, however, share the Extended Cube World FAQ from the creator's blog since it pretty much answers all the questions I had about this game.
Extended Cube World FAQ Q: When will Cube World be released? A: I'm currently tuning and fixing everything but I don't know how long it will take and can't estimate a release date.
Q: How many persons are working on this game? A: Just me. I started this as a small hobby project in June 2011.
Q: Can I help with programming, graphics, sound, music etc? A: Thanks, but I want to do everything by myself.
Q: Which platforms are supported? A: Currently just Windows PC. Mac support is planned in the future.
Q: Which games inspired you? A: - Minecraft: Endless random world made up of blocks - Zelda, Secret of Mana, Landstalker, Monster Hunter and more: Style, gameplay, overall feel - Diablo, World of Warcraft: RPG elements - And many more
Q: Which features do you still want to add? A: - Player customization: I'm planning to add player customization whith different faces, hair styles etc. - Classes: I'm planning to add a mage class next and more classes in the future - Different playable races - Quests: A variety of different quests - Items: Different weapons, armor and other items - Building: Different blueprints and materials - Weapon/Armor upgrading system - Different pets
Q: Is there multiplayer support? A: Yes, you can do everything in the game cooperatively with friends. I can't say anything about maximum players per server because it still needs to be optimized and tested.
Q: Will you add mining/building/crafting? A: - I'm not planning to add mining or digging. - House building is supported. - I will probably add a crafting system that allows you to craft weapons and armor from loot dropped by monsters.
Q: How do you create this game? A: I've programmed everything with C++ and DirectX (OpenGL for the first version). For the voxel sprites, I created my own voxel editor.
Q: Will the final game still be called "Cube World"? A: Probably not. It's currently just the project name. I'll have to come up with a new name soon.
You can read more about the game's development here as well as updates about what content and features being added at http://wollay.blogspot.com