It's an awesome sci-fi horror FPS/RPG, with stealth and metroidvania elements. It's from Arkane, who made both Dishonored games.
The story and atmosphere are really good (don't look up spoilers if you intend to play it), there are multiple ways of reaching your objectives, and multiple endings according to your choices. The graphics and design are really nice.
Not a big fan of horror games in general but it's one of my favorite games of the last decade.
I haven't played it on the Steam Deck, so I can speak to its performance, but I really enjoyed this game. It's a whole lot of fun of you like mysterious, creepy games with some jump scares. I'd say its closest comparable is BioShock 1 & 2.
Infinite is a very different type of game than 1 & 2. I absolutely loved all 3 (1 and 3 more than 2 tbh). But if you really liked 1&2, you may not like infinite, and vice versa. 1&2 are dark and suspenseful. Infinite is well-lit and they stopped doing most of the jump scares. But the gameplay felt amazing and the story was a 10/10.