Catherine is really good.
This guy, who seems to be having doubts about his relationship with his girlfriend Katherine (including cheating on her with the titular "Catherine", despite not remembering that happening), gets nightmares about things that are going on in his life, and if he dies in those nightmares he dies for real.
The fun part here is that those "nightmares" are really fun and surprisingly original and hard block-pushing puzzles, where the goal is to "build" your way to the goal on top (sometimes with giant bosses trying to kill you). There's frankly nothing else like this in the industry right now.