This game is fully Internet-capable already, don't worry! In fact, most of our alpha testing was done over the Internet with four players and no VPN software. You do have to type in the host's IP address when not on a LAN, and the host has to have a single UDP port open/forwarded to their machine, but that's it! You can try it out with the demo first if you aren't confident it will work with your specific setup if there are unusual constraints, but it's designed for Internet play as much as LAN play.
Thanks for your interest in the game!