This game is currently in the Concept Phase which means it is getting designed and developed. You cannot preview it until later. First Out will start off as a single player game but might turn into a mult-player game depending on it's popularity.
The aim of the game is to undertake a physical challenge and the player that exits first within a time restriction wins. For example, in one level you have to jump a deep lake. The next level will see you jump the lake with some wind resistance! So there will be many levels having different obstacles and challenges.
Check this description for "First Out" Updates in the future.