I downloaded this app by Bethesda for the iOS, and gave it a try. It puts you in the role of an Overseer, and you build, expand, maintain your vault whilst trying to produce resources and keep your Vault Dwellers happy.
It's certainly an interesting game but in my opinion there's just too much busywork for an iPhone game. You have to fire up the game periodically to collect resources and unfortunately when you're not in the game the clock still ticks and one can run low on resources, to the detriment of your Vault.
I wish the game could auto collect when you're not in game. As it is I find myself frequently running low on water and energy.
So, good concept but I think the game could be tweaked further.