This is a fantastic little number from Spooky Squid Games. On the surface, it's a pretty ordinary isometric action game, but what makes it special is the dynamic narration that describes your gradual loss of sanity as the game progresses. From the official site:
Throughout the game your status, the actions you take and the locations you explore are narrated back to you in the style of classic horror master H.P. Lovecraft with full high quality voice acting.
To get a sense of how the narration works, check out the slightly spoilery video, or just go and download the damn thing.