I'll be honest. Theres nothing in that video that i have yet to see that Minecraft can't do. I think that a lot of people look at minecraft alone, and not mods :/ there are plenty of mods out there that will allow you to add curved blocks, mini blocks, and even more fun stuff. Especially with Minecraft Tekkit mods... +minecraft has the ability to export finished products/save/share/etc when games like this dont. Still yet to see the point to them.
Im not saying the game is terrible, but I just personally would rather just stick with a modded tekkit server.
also @"Glen" yeah its just a rip off of Minecraft that just runs off more than just the theme of "blocks". It's not illigal to copy minecrafts idea or theme but it is frowned upon by a lot of people.