Next version will have the ability to resize the window, though it will take some time until that is released. If you would like to volunteer some time to test a Linux version, you could join the Discord server I run for this game and I could make a new build and try to get to the bottom of this. I really am lacking any feedback from Linux, and I don't have a computer with it so I'm working blind.
I suppose the other thing I should consider is whether a Linux version should exist if it's not working. I assume Unity knows what it's doing, and maybe others can run it just fine, but I wouldn't want to accidentally false advertise.