Um... I'm sorry to read that.
The demo was working properly but not the full version?
Try to delete the files related to the game.
I'll check everything on my side.
What computer configuration do you have?
Do you see the loading?
I think the problem comes from the RAM, because it needs a lot for the initialisation.
I'll create a savefile for you to see if it crashes only during the creation, drop it in:
C:\Users\YourName\AppData\LocalLow\Le triangle à l'harmonica\Quartier-Maître
WeTransfer link for the file: https://we.tl/t-aEX41McvhH

