I've been playing this game for about 6 days now since it's release. It's honestly the most attention I've given to a mobile game in a while. Fallout Shelter is a micro-managing 2D game where you play as the overseer to your own vault. Each member(dweller) of your vault has specific stats that will help in the different rooms you can build. Your vault relies on power, water, and food; Consequently, these rely on the ability of your dwellers to work in certain rooms. The best part, in my opinion, is that I have not had to spend a dime playing this game to have a blast. The only micro-transaction available is buying extra lunchboxes which give you chances for extra loot and people. I could be biased as I am a die-hard fan of RPGs and Fallout, but I sincerely recommend trying it. It's only available for IOS now, with android coming in a few months.