Unfortunately it looks like these may have been uploaded by someone other than the real developer. I actually messaged the dev team at https://support.ragequitgames.com/ and mentioned the Windows versions with only the .exe files. The response I got said these are not official links.
The animal simulator .apk Android files seem to be the real deal, but maybe unofficially uploaded to Itch.
I didn't actually purchase anything for money. At first, when I assumed these were uploaded by the real dev, if the PC versions (Cat and Dog) had looked like real playable versions (zip or rar of a believeable number of mb), I very likely would have paid for them.