Really excited cause I got it somewhat working. mouse still sucks but here we go...

besides the missing sergoeui font other already reported (if this one is missing the game crashes) it seems that other fonts are also missing.

to resolve the issue i checked W10 standard fonts: https://learn.microsoft.com/en-us/typography/fonts/windows_10_font_list

Extracted all TTF i get (bash):

fonts="arial.ttf ... wingding.ttf" # shortened list

cd ~/.steam/debian-installation/steamapps/compatdata/593030/pfx/drive_c/windows/Fonts

ttf="REPLACETHIS" # check the Fonts dir and chose one, i.e. micross.ttf

for f in $fonts; do [ -f $f ] || ln -s "$ttf" $f; done