Superhot
I backed Superhot on Kickstarter back in June of 2014. The beta sold me within minutes. It's a first person shooter where time only moves when you do. This turns the tried and true gameplay of FPS into a half shooter / half puzzle game. Each step moves an enemy or their bullets closer to causing your demise. I had almost forgotten about the game until I got an e-mail with their launch date earlier this year. The full game is even more fun than the beta.
I could talk about the game all day, but you really should watch the trailer. You can buy Superhot on the App Store for $24.99.