Disabling full screen optimizations for testapp.exe in the game folder seems to work. You can launch the game from there, or create a shortcut, it bypasses Steam all together. testapp.exe can then be added back to your steam library through "add a non-steam game to library" thus letting you use any overlay controller settings you may need. Once it's been added back, right click testapp.exe in the steam library, go to properties and you can rename it to Geometry Wars. I tested it on Windows 10- i7 12700K / Windows 11- i9 12900K, 3080Ti's, DDR5, all drivers/windows up to date.