Fly through and dodge moving bones as various characters such as Frisk, Sans, Papyrus and Mettaton. One-tap controls.
Capture souls to change colour and earn coins to unlock new characters at the shop! Legend says there is a secret ending if you reach far enough in Flappy Tale.
Disclaimer: Flappy Tale is an Undertale fan-game. Thanks TrixNii for the pixel fan-art of Seam.