A Shoot-Them-Up that teaches the skills of spatial memorization. Ew, that sounds terrible, let me write that again.
A ShootEmUp that takes your teeth and feeds them to it's invisible guard dogs. Too aggressive?
A Shmup that focuses on pattern memorization. As your score goes up, everything on the screen goes slowly invisible, forcing you to survive in the dark.
Note: No, the thing at the top is not cheese, it is the Sun.