Hi! Sorry for the late reply. Are you still having issues with this?
Firstly you'll need to extract the files from the .zip file using your prefered archiver. I use 7zip.
If you're on windows, look for the file named "lootbox sim.exe" and run that to start the game. There is only the windows build as this was a student project that is no longer being worked on.
Thankyou and please let me know if you have any other questions or feedback :)