Hi there! Yep unfortunately we didn't manage to set up a public server in time, so for now we only have private games.
If you have two PCs on the same network, you don't have to do any port forwarding, simply leave the address box blank and it will default to localhost. If one player hosts the other should be able to join!
Otherwise, port forwarding is fairly straightforward to set up with a bit of Googling. Port 9603 needs to be opened by the host. Player 2 must then enter your public IP, which can be found online.
If you want to challenge me, shoot me an email at enquiries.biotech@gmail.com - I'm happy to host!