An Arena last-man-standing type games. Teams are a function, and you can see the other persons health bar and where he is. You can craft many things with what you find or just find things in building. You can interact with many things like posion gas tanks to release the gas. At the end, posion gas closes everyone in to a middle arena until the end of the match.
Some of my friends have been playing these types of games. They said your game is most definitely The Culling.
I mistook it for hz1z I've seen them play, but I got corrected. Both of them have the poison gas aspect, but crafting and more details match The Culling.