Move your cursor/finger for Mafuyu to follow it. Collect as many crystals as you can. What's going to happen: The longer you play, more Akitos will be added to make it more difficult to survive. Before one spawns, it will take the form of a flick note (safe to touch) which will warn you to move away. The arrow of the flick note tells you which way the Akito will move when it first spawns.
The art is from the hit game project sekai: colourful stage featuring hatsune miku.