Recent reviews by Speck

Not even worth it on sale. If you want a good co-op horror/puzzle game to play with a friend, check out the We Were Here series; the first entry is free, they contain actual puzzles, and are a delight to play.
I have nothing positive to say about The Watchers. Do not buy or play this game.

Lots of fun to play with a friend who loves puzzles as much as you do.

Definitely good to go in with expectations for each role though; Librarian has to view puzzles from a top-level perspective and be able to sift through superfluous data, while Explorer has to be capable of reacting to tense situations and following directions to the letter.

Both players should have at least middling communication skills as well as a pen and piece of scratch paper if you want to get through.

It's a solid game and a great entry to the unfortunately sparse co-op-puzzler market, and I'm looking forward to seeing more.

Keep looking for that hidden achievement; the solution makes perfect sense when you really consider environmental clues.