Well I got a good survival manhwa for you but...it is a novel. It is super underrated, it deserves more recognition. If you are fine with it, the title is "Omniscient Reader's Viewpoint". It has a unique concept that's more noticeable in later chapters. I hope it got adopted into a manhwa soon though.
Prequel: http://www.mangago.me/read-manga/kamisama_no_iutoori_fujimura_akeji/
Sequel: http://www.mangago.me/read-manga/kamisama_no_iutoori_ii/
I personally found some of the prequel characters more entertaining but overall not too bad from what i can remember since I've never finished the sequel but got pretty far in it.
Oh I haven't done reading the second one, now you made me remember to continue reading it XD.
Try Cage of Eden
So it's kind of a long story but I've recently gotten hooked unto survival game kind of manga/manhwa [or well...I'm trying to find good ones to read because I'm curious about the topic...] If you guys have any, please fell free to tell me!