Point and click recomendation and GA

In addition to all the great recommendations so far, I wanna introduce you to this guy or this guy over on YouTube, they're both got some nice and entertaining PnC reviews, with some hidden gems. Might help you make your mind up about some games. :)

Fran Bow - surprisingly good horror style game with great atmosphere and setting. I really enjoyed it.

Kathy Rain - fantastic mystery game, with great writing and characters.

The Longest Journey - a bit dated, but still a fantastic mystery game with great characters, writing, setting, and story.

Metal Dead

• New but feels totally old school
• Very hidden gem
• Zombie apocalypse setting, but stay away if you are looking for creepy atmospheres because this is dark comedy.

Play it if you want to try facing a zombie apocalypse in a point & click game with a helpful friend's head in your pocket.

These are old, but good.

Beneath a steel sky.
Lure of the Temptress.
Legend of Kyrandia.
Flight of the Amazon Queen.

Gabriel Knight: Sins of the Fathers 20th Anniversary Edition One of the best PnC games! (Mystery)
Detective Grimoire Very good game, enjoyed my playthrough. (mystery)
Demetrios - The BIG Cynical Adventure Very funny game (not horror but can fit in mystery but comedy is the main genre)
Puzzle Agent Good puzzles with a mystery story
The Samaritan Paradox I enjoyed this game (Mystery)