Does anybody know if there is crossplay implemented in this game?
I tried to play a multiplayer game but no match could be available and no one entered when I hosted one. I tried for some time but it still remained empty.
Or is there some Galaxy issue? Some Galaxy stuff seems to be broken with this game (no activity feed, it is displayed as "unknown version" and can't verify instalation...)

Fixed most Galaxy features by doing that, thanks!
Anyway, the multiplayer lobby remains as empty as always, so probably there's no crossplay...

Edit: Just found a steam user in the lobby, so there is crossplay multiplayer, definitely. Btw, not many users go into this mode and, as it is 1v1, it is not easy to find a match.

As you already mentioned, there is indeed crossplay, alas, this is not the most popular genre for multiplayer. If you're looking for opponents I recommend checking out our Discord group, we actually have a channel there for setting up multiplayer matches. Thanks for bringing this to our attention. Forwarding this.