Hmm..sorry about that. I don't have a mac to test my builds, but I'll see if I can borrow my sister's macbook so I can look into it.
In the meantime you can try this since you're able to play it on your browser:
- Open this link in your browser (https://itch.io/embed-upload/8204111?color=272726). This is the direct link to the game Toe II Toe on itch.io
- You can now install that as an app. I'm not sure what your browser is, but I'll assume it's safari since you're on mac. I think it's File > add to Dock. That should download and install Toe to Toe as a web app, and you can now play it offline.