Dumpster Gang couch co op does not exist in the demo: all multiplayer is online, and while crossplay is planned, the developers cannot promise it yet.
Dumpster Gang couch co op is not in the demo
All multiplayer in the demo is online. Asked directly about couch co-op, the developers said they would certainly love to have it but cannot make any promises yet, and the split-screen requests in the feedback threads get the same answer.
The game is built around online co-op for 1-4 players, so split-screen is not something to plan a game night around today. For what you can actually do right now, the party and invites guide covers the lobby, the four-player cap and how to get people into a session.
Crossplay is planned, not confirmed
Answering a question about cross-platform play, the developers said the plan is for some sort of crossplay but that they are still finalizing the details and cannot promise anything 100% yet.
The rollout order is the other half of that answer. The team is fully focused on the PC release on December 3, 2026 (Steam, Xbox on PC and PC Game Pass), while PlayStation 5, Xbox Series X|S and Nintendo Switch 2 versions are announced for March 2027. Until those versions exist, cross-platform parties that mix PC and console cannot be tested at all. The demo guide covers what is playable today.
Steam Deck and Linux
The developers say it runs quite well on the Steam Deck in their own testing, and that their goal is to be Steam Deck verified for launch, even though the store page does not carry the badge yet. They also report playing it without trouble on low-end machines.
Linux is the caveat rather than the Deck itself. Several Linux players had launch or online-play failures and found that Proton 11 or Proton Experimental works while GE-Proton does not — so on a Linux desktop, switch Proton versions before you write the game off.