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(+1)

It's completely cross-platform, you can play the itch.io version with players on Steam, Discord, and PlayStation 4.  Only caveat is that to play on the official public servers you must be signed in to Steam or Discord for authentication (doesn't matter where you bought it from though).  Dedicated servers (if you or a friend runs one) can be configured as to whether they accept any connection or only authenticated (Steam/Discord/PSN) users.

(+1)

Very cool, thanks! You have one more satisfied customer.