I'm afraid I'm not sure, as I don't own a Mac. This game is also available for Mac through Steam - maybe give us a shot over there? Sorry for the inconvenience!
https://slime64.com
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I sadly can't access the steam page, because it doesn't have any rating (german law mandates it now)
You can find out how its done on this site: https://steamcommunity.com/groups/steamworks/announcements/detail/46787682767685...
It only takes 5 min and doesn't cost anything.
Hi Tara! Thank you for reaching out! You're actually the second German player who has reached out about this. What was strange was that Steam was telling me I had already filled out everything I needed, but upon re-submitting all the necessary forms, it seems to have stuck! Could you do me a favor and check again?
Thanks so much, and happy new year!