Wendy: Every Witch Way is a fun little platformer for the Game Boy Color. The story is that Wendy the Good Little Witch accidentally releases the Chaos Emeralds from a treasure chest after clipping through the wall to her attic. The restless emeralds then proceed to knock down a floating castle that was blocking their view of the moon, and Wendy must flip her way through the castle to get the emeralds back.
This run abuses the game's gravity mechanic heavily, essentially making it a cuter version of Metal Storm.