EchoDrop
Runs entirely in the browser: no install, no sign-up, on any phone. This game is heading for Google Play — the demo version is open here on the playground.
About the game
You are blind: the lamp on your helmet reaches half a metre. A PING sends out a droplet of sound like sonar — for an instant it draws the hall and the creatures in it, then the darkness eats it all back. A BLAST is the second wave, splitting things apart at point-blank range. You get ONE charge: look, or strike. Five floors, a key and a door; furry little balls with eyes, and a watcher that wakes to your own sound.
How to play
Open the game and start right away — no install, no account. On a computer use the mouse or arrow keys, on a phone just tap. Your result is stored on your own device.