You could always try Gdrive or pixeldrain. There are others but I can't guarantee their safety. The issue with Mega is that it likes to fail.
I'd recommend turning the file into a rar, regardless (not 7z, just rar).
Joiplay is used to play most win Itch games on android, mainly html, renpy, ruffle, and rpgmaker. If it's not made in renpy that explains it.