Gullrock Light, 1898. The lamp is out. So is the keeper.
The supply boat left you on the rock to find out why the light went dark. You climbed to the watch room. The hatch slammed shut beneath you, and your little lantern shows only what's within arm's reach. Somewhere in the black, the keeper left a way out.
Sound on, please. Walk with the arrow keys or WASD (or tap), inspect with E. The clock ticks only while the lighthouse is on screen. There is no time limit, but every hint costs you two minutes.
Welcome back, . The dark has been waiting for you.