Not wishing to dampen its many pyrotechnics, but Genki may be getting a little long in the tooth as the Normal mode seems more than ample evidence of its bullet hell. Yet for those made of stronger stuff there are also Burst and Caravan modes, which may well require a pad or joystick made of stronger stuff. Independent eye movement isn't mentioned as a requirement on the box, yet would definitely be an advantage.
Second hand. Cero C. Limited edition comes with Famitsu Xbox 360 Bullet Soul Special publication, Game on Demand code leaflet and Arrange soundtrack.