itch.io

Online Mode note (Play-in-browser):
Online Duel currently works only in the downloadable EXE. The browser build can’t use the same networking yet. If you want to play online with a friend, download the EXE for now — I’m working on bringing online support to the web version.

also there is a issue where if you go into online mode and then exit that menu to go into solo duel mode it puts you into matchmaking and you cant escape that so for now avoid that button unless youre trying to play online im pretty sure that bug doesn't exist on the exe ill get on to that