By piloting a laser spaceship, “Cascade” invites you to defend a brain from Alzheimer’s-causing proteins. In Cascade, players take control over a green spaceship tasked with defending large, white brain cells known as neurons from the amyloid plaques hypothesized to be the primary cause of the disease. Combined with an Oculus Rift, the result is an immersive gaming experience than can help significantly people with Alzheimer’s disease.