I do the same with my steam library!
I test the new games and if I don't like them I hide them from the library. If I do like them I classify them into other tags including "in progress" for linear games that can be completed and "multiplayer" / "casual" / etc for other kinds of games that I wanna play again in the future.

Same! I went so far as to use the tags you see in the steam store. Makes it handy to figure out what you want to play depending on the mood.