Of course, the sensible thing would be to use an existing game engine, but after a certain point, there is some curiosity if learning and fighting yet another game engine is really quicker that just writing something from scratch.
Download this game from App Store:
https://itunes.apple.com/us/app/argog/id969087990?ls=1&mt=8
Download this game from Google Play:
https://play.google.com/store/apps/details?id=com.wolvesrealm.argog