For me it has been working without doing anything, so this might be a pain to debug since I can’t test anything. But i’ll list a few things you can do with Proton maybe you’ll have some luck.
First i’d try opting into/out of the Steambeta client, which is what I’m using, perhaps Steam have done something that might have changed since regular release. I’ve actually had moments when Tower didn’t run and then switching beta/release worked.
You can get a proton log by putting
PROTON_LOG=1 %command% as the launch option in Steam. The logs will be in the Tower Unite game directory named: Tower-Win64-Shipping_dxgi.log and Tower-Win64-Shipping_d3d11.log <-- If you use dx11 option.
In case it’s useful to compare your own, I put my logs to pastebin but I’m not confident they’ll show anything useful, but who knows.
If you want to report a crash log(hopefully they’re generated for you), maybe they can uncover what you might need, i’d let the developers know in that post that it’s Proton related.
Crash dumps are located here;
/steamapps/compatdata/394690/pfx/drive_c/users/steamuser/Local Settings/Application Data/Tower/Saved/Crashes/
You can also set Tower Unite to use different Proton versions, on Steams Tower Properties you can select it to force use a different version, perhaps will get different results. For me personally I haven’t seen much difference between them as they all work. I do know however the latest 4.11-2 version is choppy, so I use 4.2-9.
If you want to access protons winecfg settings, you can do with the terminal command;
Just double check the directory is the same.
You’ll need winecfg, but you have to be careful what you edit there, changing smaller settings is fine, you can always revert them, I wouldn’t mess with library overrides, especially since the default settings work for me and others I don’t believe the settings should matter, but it’s an option you can look into.
I can only imagine as extra steps is to make sure drivers are up-to-date and your PC is restarted after that, if you have any major updates like Kernel / driver related things, make sure you restart afterwards because games likely won’t run,. I’ve had the very problem of getting an update then games not doing anything.
I want to help more but I don’t know what to suggest, I’ve played on Ubuntu 14.04 and now 18.04, with multiple Kernel versions and every time it has just worked.
Currently on Ubuntu with KDE Plasma 5, kernel 5.2.5-050205-generic, Nvidia 430.40.
HW: Intel i5 9600k, GTX 1060.