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I checked the log and the problem is: 

Error loading /home/XXX/.config/itch/apps/Neon Skylines/Neon_Data/Plugins/x86/ScreenSelector.so: libgtk-x11-2.0.so.0: cannot open shared object file: No such file or directory


So I installed libgtk and it seems to work now.

Thanks for the libgtk tip. That fixed it for me.