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Co-op now shares fights, cutscenes and the ending.
Enemies. Players in the same place fight the same enemies. Damage anyone deals counts for everyone, an enemy one player defeats is gone for the others, and each enemy follows the game of the player nearest to it, so it's in the same place for everyone.
Bosses. Boss health is shared, and the boss follows the game of whoever entered the boss room first. Whoever lands the final hit gets the warp, and everyone else in that dungeon goes with them.
Cutscenes. When a story cutscene takes you somewhere, players standing near you go along and watch it too. The ending takes everyone in the room, wherever they are. During your own cutscenes and conversations, other players are hidden and nothing pulls you away.
Chests and doors. A chest or door your partner opens now shows as open in your game too, once you're not standing right next to it.
Pickups. A heart container, heart piece or key your partner already took doesn't count twice if you grab your own copy. Things the story takes away (the sword in the Forsaken Fortress) aren't handed back by your partner's game.
Reliability. Warps and cutscene follows survive a dropped packet and a paused game. Enemies that grab you (Floormasters, ReDeads) are never moved or removed. A flag that flickers during a busy moment syncs again after a couple of quiet minutes.
New toggles in the Multiplayer tab: "Share enemies and bosses" and "Watch story cutscenes together" (both on).
Still per player: cutscenes that don't move you to another place, enemies' AI (only their position, health and defeat are shared), and items in the spoils, bait and delivery bags.
Everyone in a room needs 0.2.1. No rebuild needed when updating from 0.1.1 or later: the game code didn't change.