Version 1.2 is now available and should fix most issues! I have finally been able to find the time to go through the whole game and fix all I could. Now the game is fully playable from beginning to end. If you get stuck somewhere, please let me know as it could be an unknown bug.
Also the wacatac trojan mentionned before is a false positive that happens with many itchio games (and most programs that are not Microsoft approved). Please ignore it, there is no risk.
This episode of Francium is quite long, so don't forget to save from time to time. The menu finally works :) Soon I'll try to add French localization. Have fun with the game!