Publishing a Linux-native build is never as simple as just ticking a checkbox. It's a completely different platform with entirely new challenges that require considerable effort on the developers' part. Those challenges extend not only to the game itself but the dependencies and their versions, their availability on various distributions (see the difference in package versions between Debian and Arch for example), and integration into the various desktop environments and window managers, making sure that both Wayland and X11 work.
Factorio has a Linux-native build, which is maintained by *one person*, who wrote an article about their experience: https://factorio.com/blog/post/fff-408.
While a Linux-native build would be nice, VotV works well enough on Proton, and maintaining the Linux platform would inevitably take people and resources away from improving *the game*. Overall, I don't think a Linux-native build is necessary or justified at this stage of the development.
I personally use the Faugus Launcher with either the "Proton-CachyOS Latest" or "GE-Proton Latest" runner, MangoHUD, Gamemode, and Gamescope.