Each stage is a claustrophobic array of colored prisms; your goal is to flip the blue triangle on its vertices to push other shapes into the correct spots.
Pushing one triangle can shift entire sections, letting you strategically make space to move while being careful not to knock other triangles off the board.
Choosing vertices where triangle connect let you turn them all in a single move, opening the door for more complex puzzles with more colors and larger boards.
Yankai's Peak is still in early development, with no release date at the moment. You can follow its progress on Twitter.