Try to unpack the game file twice.
https://emika-games.itch.io/fathers-day/devlog/456045/problems-with-unpacking-th...
when I downloaded the game there was no zip file or any file to unpack. The download for me only had 2 items, neither of them was the game (I don't think) there was a notepad document and the other was something that when opened I had to choose an app to open it like 'word' or 'adobe' if you would like I can send you some screenshots in discord, my username is Bread_836#3010