And with the code on terminal: 
Viewing post in Dawnfolk (Itch Exclusive Supporter Edition) comments
Thanks for testing! The code in the terminal is not working because it does not have the right path to the application. Replace "Lueur.app" with the correct path to the application (where you saved it on on your computer).
If you don't understand, send me a screenshot of the folder where the game app is with the path visible and I'll give you the correct command.
Thank you!
Thanks for your help ! This is the message :
Last login: Wed Feb 19 07:40:33 on console
raphaellacaille@MacBook-Pro-3 Lueur.app % xattr -d
Not enough arguments for option -d. Expected at least 2 but got 0
usage: xattr [-l] [-r] [-s] [-v] [-x] file [file ...]
xattr -p [-l] [-r] [-s] [-v] [-x] attr_name file [file ...]
xattr -w [-r] [-s] [-x] attr_name attr_value file [file ...]
xattr -d [-r] [-s] attr_name file [file ...]
xattr -c [-r] [-s] file [file ...]
The first form lists the names of all xattrs on the given file(s).
The second form (-p) prints the value of the xattr attr_name.
The third form (-w) sets the value of the xattr attr_name to the string attr_value.
The fourth form (-d) deletes the xattr attr_name.
The fifth form (-c) deletes (clears) all xattrs.
options:
-h: print this help
-l: print long format (attr_name: attr_value and hex output has offsets and
ascii representation)
-r: act recursively
-s: act on the symbolic link itself rather than what the link points to
-v: also print filename (automatic with -r and with multiple files)
-x: attr_value is represented as a hex string for input and output
raphaellacaille@MacBook-Pro-3 Lueur.app %
Huh, this is getting really annoying, I'm sorry. Other people who had the issue managed to fix it with this line, I guess maybe your OS has something different. I removed the app from the itch page, I'll put it back when I know for sure this problem won't happen again. Do you use steam to play games? I can send you a steam key by mail if you'd like, Steam sign all games directly so it should not have that issue. Reach out to me at darenn@dawnfolk.com and I'll give you one.
If you don't want a steam key, send me your paypal by mail, I'm gonna refund you.