depending on how receptive they are to other types of games (non-fps/AAA). They kind of came to mind based on the context you're asking in.

'The Witness' is a first-person puzzle game, it's not everyone's cup of tea but it can feel pretty engrossing and rewarding if you get sucked into it, and has an underlying philosophy that might be useful getting him to think about things in a different way, or they might just think it's some lame attempt at therapy.

'Night in the Woods' is a pretty narrative side-scroller. The characters are very much dealing with different kinds of stress and depression, it's in a small-town/college dropout setting but can be pretty relateable, a lot of people who really like it say it helped them through some down parts of their life.

It's possible a teenager might not care for any of this.