GMod 1398 on the Half-Life 3 engine includes sentient artificial intelligence and 100% realistic physics. Also worth checking out. Valve sure took their time with that one. Maps are procedurally generated to the edge of the universe. Watch out for Space Metrocops.
i know a game called castle story. the problem is IT IS NOT OUT YET but the prototype will be in 6 days.
in castlestory you control little dudes that work for you. you must make a castle to surive the night. basically like minecraft (mining and all that stuff)but you dont do it your minions do.
check out the website .(it also has a countdown) http://castlestoryonline.com/