Look at tags in steam raft it's free to play yeeeeeeeesssssssss
Sorry to burst your bubble but it'll cost 19.99$.
http://blog.raft-game.com/2018/04/06/blog-32-a-date-has-been-set/
"We can also announce that Raft will be sold for 19,99 USD. "
Those tags are USER DEFINED and developer has nothing to do with them.