Please download direct from the web site. Don't use the Itch downloader. What happens when you try to launch the game? Are you Mac or Windows?
We will need to look at your log file to see what's causing the error. This is a file that is generated in the main folder when you launch the game called 'log.' Please contact me through our contact page so I can instruct you on how to email this to us. https://ypressgames.com/contact/