Is the idea to get lost in flow?
Video games can be great for anxiety. It's been a long time since I've played any, but I found I would lose track of time and enter what I think people call flow.
There was this one at a community clinic I went to that connected to you via some sort of skin conductor—I guess it measured your stress level somehow—and you got to control a hot air balloon up and down with your mind. This was so long ago and for some reason they only demonstrated it to me. I didn't actually get to use it for long, but I think I would have liked it.
I bought Muse which is an EEG headband and I was hoping it would do something similar. You meditate with it and when you're meditating "well" the sounds are calm and you hear birds chirping. If your thoughts start to drift it gets windier sounding or you hear waves crashing, etc., depending on the scene. The good part about it is that it actually works. The part I don't like is that I am someone who gets very anxious focusing on the breath. I start breathing strangely. And while you don't have to focus on the breath in Muse, I think that's how it's working in part. Those are the instructions they give. I notice if I do focus on the breath I do well in it, but I just don't find focusing on the breath too helpful. It makes me breath weird. There's enough tech there it seems like they could add some game type thing (like the hot air balloon). There's another app that lets you see the raw EEG data, and I can't make heads or tails of it, but it looks science-y to me (the axis orientation is definitely accurate).