The acronym says it all :) procedurally generated shapes moves on the screen and the player has to get only one of each kind. You start with simple shapes with simple colors then shapes become more and more complex by composing two shapes and adding movements/effects to the shapes.
Excellent idea. My favourite so far. This does something to your brain (something I also tried to achieve in my own game). Clever and simple procedural/random generation. Really linked to the theme:
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