- install KSA using normal wine to a location outside of the WINEPREFIX (e.g. Z:/mnt/Games/KSA)
- add KSA.exe to Steam as an external Game
- install dotnetdesktop9 via protontricks (might need to start the game once and let it crash to show up in the list)
- launch the game
you can play KSA on linux rn:
export WINEPREFIX=$HOME/KSA-PFX
wine /path/to/KSA-setup.exe
winetricks -q dotnetdesktop9
cd /path/to/Kitten Space Agency
wine KSA.exe
edit1: dxvk and vkd3d not needed (thanks irasponsible)