Greyward: Castaway Survival

The tide brought you here. The towers will keep you here.
You wake on the shore of a misty island beside a strange old vessel, its ribs carved with glowing runes. By day the island is yours to explore. By night the Grey rolls in, a mist that burns anyone caught outside the fort.
Gather driftwood, pitch a camp and light the fire. Then grow the camp, help the other castaways, and learn why the rune towers stand on every island.
Survive the island

[*][b]Day, night and the Grey.[/b] Be inside the fort by dusk, or plant torches and moon lanterns to hold the mist back. Every fourth night the mist rolls in thick.

[*][b]Hunger, cold and weather.[/b] Rain, storms and snow chill you. Cook stews at the camp fire, brew herbal tea, wear fur.

[*][b]Craft your way up.[/b] Stone axes and flint spears first, then bone, obsidian and moon shards. Set spike traps, tame a wolf.

[*][b]Grow your camp.[/b] A drying rack, a rain shelter, a smokehouse. Each upgrade makes the island a little kinder.

Climb the rune towers
Every island has a rune tower with endless floors. Every tenth floor a guardian waits: rune pillars shield it, and each island's guardians call down their own hazards. Beat the guardians of floors 10, 20 and 30 for gear found nowhere else.

Break the Grey camps
Eight of the vessel's crew were taken by the Grey. They now lead walled camps at the four winds of the island, each guarding a Grey Heart. Clear the guards, beat the chief, and free them one by one. The far islands have Grey camps of their own.
Sail to eight far islands
Take the strange vessel out to sea: a cane-field isle, frozen crags, a volcano, a land of rusted machines, a thorn jungle, a coral reef, cloud-high crags and a dark isle. Each has its own creatures, bosses, rune tower and a page of the vessel's log.

Together on Steam
Open a room and invite up to three friends with Steam. Defend the same fort, climb the towers together (every extra climber raises the rewards), and wake the twin rune stones that only answer two castaways at once. Everyone brings their own castaway and takes the progress home.
Also
[*]Five villagers with their own requests, daily help and a corner of the fort to build.
[*]A different event every day: a trader's raft, a falling star, a fish run, a washed-up crate.
[*]Fishing, planting beds and animals, a journal of goals and feats.
[*]Generative music that follows the day, the night, the storm and the fight.
[*]Steam achievements, Steam Cloud saves, controller support.
[*]English and Vietnamese.