Sorry about that — that's actually my mistake! 😅
I created a simulation of two public servers, but I didn't have enough time to fully implement them before the jam ended, so right now they are a bit misleading.
To play the game, you need to select Create Room, choose a map (unfortunately there is only one available at the moment), and share the generated room password with a second player.
The second player should then select Join Room and enter that password in the Password field.
You can also launch a second instance of the game on the same PC and connect from there. However, I recommend playing as the first player (the host), since that instance is responsible for enemy spawning and controlling the game flow.
Thank you for trying the game, and thank you for the kind words about the music and atmosphere! 😄