Arcade
You are a little bat in a pitch-dark cave. You can't see the walls — every flap sends out an echo that lights them up for a moment. Echoes cost energy, so use them wisely and eat glowing moths to recharge.
Fly as far as you can without touching the walls or the sharp rocks. Every moth is worth 10 points and one echo.
Hold Space, ↑ or the mouse button to fly up, release to glide down. Every new press sends an echo.
Hold the screen to fly up, let go to glide down. Every new tap sends an echo.