Steamdeck version requires Proton-hotfix

If you are playing the steamdeck version of Sacre Bleu and you run into crashes after the main-menu, you likely need to install the proton-hotfix

Click Game Info -> Properties -> Compatability -> and turn ON the "force use of a specific Steam Play Compatability tool"

This is what the menus looks like:

Here is Steams FAQ about the proton