This was fun! Not sure how you got this on the steam servers but I played a full round with my buddy and we had a good time, I'd love to see how the dynamics change with more than 2 people, it's a really fun mechanic.
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Glad you enjoy it ^^
It's not working on Steam servers, server runs on your PC when you create the game, Steam only manages connecting players together (via session tracking) and ports forwarding for you (so you server is on your public IP) and for that you only need to use test Steam ID which is 480 and it's visible as "Spacewar" and thats what you should use for Jam