On Mac OS X Big Sur. Tried all the solutions below, tried all that I could find online (and there are about 7 different ways). They do not work. Please prepare this application for Mac OS X Big Sur as well as Catalina and below. I'd love to actually use it.
Viewing post in Pixel Character Creator v1.1 comments
extract the app in your Applications directory, then paste this in terminal "cd /Applications/Pixel_Character_Creator.app/Contents/MacOS" and press Enter , it should change your directory to /Applications/Pixel_Character_Creator.app/Contents/MacOS , if true then paste this in terminal "chmod -R +x" this will change permission for the folder to Read/Write/Execute, then paste this "sudo spctl --master-disable" and try to double click the app again . if it doesn't work then paste this "chmod 755 /Applications/Pixel_Character_Creator.app/Contents/MacOS/Pixel_Character_Creator" and try to run the app again , it should work now and you should enable your master again by pasting this command "sudo spctl --master-enable" , please reply to this comment if the problem was solved , thank you :)