"Rust" is a game made by Garry (the guy who made the forever legendary Garrys Mods). The game is in Alpha Stage just now and will go into beta soon. The game mechanics remind us of DayZ and Minecraft, the DayZ coming from the Zombie Survival part of gameplay, and the Minecraft coming from the fact that you can build a large number of things in the game such as weapons, houses, small bases and much more. The game is very glitchy and no up to par with other games at the moment and because of this only a few have been selected to test the game and give the development team feedback on how the game performs and any glitches in the game.
Edit: Found a video on FrankieonPC's channel