go into terminal on ur Mac and find the path you need to get into the game files
the command should look something like this (or at least does for me)
cd Downloads/Paper\ Lily\ Chapter\ 1\ v1/
(the initial stuff doesn't really matter, just as long as you get to the game folder)
Then, because Apple is a lil piece of garbage, ya gotta tell it that the game isn't malware, in this case just doing this command after the other should fix it I think
xattr -d com.apple.quarantine Paper\ Lily\ Chapter\ 1.app
if that don't work maybe try this one as well
chmod +x Paper\ Lily\ Chapter\ 1.app
if you downloaded the game directly into your downloads folder you can, in theory, literally just copy paste these lines into the terminal in order
This is basically all off memory and I'm just procrastinating homework by doing this but hopefully this helps ya, it's a great game!