Hi Blue The Fox!
The very first chapter seems to work a bit strange. I tried it on Steam Deck and on my PC (with integrated videocard)
On both platforms the game froze a lot right after starting the chapter and soon crashed out.
Tried changing graphics settings, no difference.
But then I played additional maps, they worked fine.
Then other chapters starting from the second one worked without any interruptions.
And surprisingly, after all of this the first chapter worked just fine.
Not sure if it will be helpful for you, but seems to be important that the mod crashes right from the start :)
Quite interesting and exciting mod actually! Enjoyed playing it
P.S. on Steam Deck it still does not work, but it is expectable