This is a steam key giveaway, made by fanatical, fanatical is a game store / bundle site

You need to have a non limited steam acc to get this, also some countries are probably region locked

Fanatical website find the link :) i cant post links, thanks steam, i will try to post a link in the comments

Go to the Fanatical website, register / login
Link your steam account to their website
Go to the giveaway page of Nomad Survival
Verify that the price is 0
Checkout
View Order and Keys
Reveal Key and redeem it (sometimes they run out of keys)

Keys expire after some time (if they are not used)