Hello! That's really strange, hmm. Can you try downloading it again? Just in case the file got corrupted while it was downloading.
If it still doesn't work, see if your Android has the "Allowing installation from unknown sources" activated. I think itchio APK games can have this problem, sometimes, since the games are not from the Google Play Store.
If neither of those options work, it may be that the OS version of your Android is not compatible and you may need a Software update.
Those are the only solutions that come to mind. If none of that works you may have to play it on a computer.