Briefly: I may be a little biased here (because I'm totally obsessed with Fallout), but Bethesda's Fallout Shelter is probably the best game of E3 2015. Unfortunately, only iOS users know the joy of being the Overseer. To soothe the Android horde, Bethesda has promised that the game will be ported to the rival OS.
Bethesda tweeted yesterday that the amazing game would head over to Android in a few months.
Yes, we're also working on Fallout Shelter for Android. Hopefully out in a few months.
— BethesdaGameStudios (@BethesdaStudios) June 16, 2015
If you simply can't wait that long (I wouldn't be able to), here's the Apple Store.