What is graveyard-keeper-multiplayer?

This project is a mod that adds two player co-op to Graveyard Keeper, a game that was originally built for a single player only. Instead of needing a separate server, the two players connect directly to each other through Steam's peer to peer networking. The mod is still in development and heading toward a beta test, but a large amount of the game is already working together for both players. Right now the mod syncs movement and animations, the passage of in game time, chopping trees and breaking stone, foraging, garden beds, and weather, which follows a schedule set by whichever player is hosting. Graves are also synced, including digging stages, reburying a body, and repairs, and carrying a corpse is synced too, with the ability to hand ownership of a carried body between the two players. Building works in three synced stages: placing a site, constructing it, and demolishing it. Crafting at workstations is cooperative, with a shared queue and a visible progress bar for both players, and inventory is handled through shared chests and stockpiles that both players can use to exchange items at the same time. Each player also keeps a personal save layered on top of the shared world, so skills, health, and quest progress stay individual even though the world itself is shared. Villagers and dungeon enemies are not synced yet. To install it, a player needs BepInEx version 5.4.23.5 in the game folder, then the mod's DLL file placed into the BepInEx plugins folder, and the game must be launched through Steam so its networking features work. Both players need to be running the same version of the mod. To play, the host presses a key to open a Steam lobby and invite their friend, and the friend accepts the invite, after which the mod transfers the host's save so both players are in the same world. The README also documents the raw network protocol used between the two players, listing each packet type and what it carries, and includes a roadmap of finished features along with what is planned next, such as a closed beta, syncing villagers, and syncing dungeon enemies.