If you look at the types of symptoms being targeted, it appears they have very struggling brains. They need to rehab motor control and more serious brain functions. This sounds more like classic brain training (Lumosity, Fit Brains, etc) except using a gaming style to encourage continued participation.

Research into brain training shows it improves skills at doing the specific tasks used in each exercise but that the improvements do not cross over into other brain skills.

Many injured brains need to be retaught to focus and make decisions. Those improvements make take a subjects skills from a 30% level to a 60% level but it will be harder to take those skills from a 60% level to a 90+% level.

I think that games or exercises that target specific skills would be more effective compared to retail variety video games that tend to be sensory intense.