This is tagged as made with Twine. Is that right? (Edit: aaah... I see!)
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When installing from the Itch desktop, there are two options -- A Witch's Word_download.zip, and WitchsWord.zip. Only the second one will Launch on macOS -- the first fails with an executable-not-found error. The downloaded files are identical except for the receipt.json.
Perhaps the first download option should be removed, or they should be renamed to explain what they are?
This game is listed as Win / Linux only -- that means it cannot be installed via the itch desktop client on macOS, even though it is a browser game. Is that intentional? I just tried a test download via the website, and it seemed to work on Chrome on macOS just fine -- at least, on quick inspection.
I think you are thinking of the non-violent magical deer forum art game "The Endless Forest", by Tale of Tales (prototype 2003, main release 2005-2009). https://en.wikipedia.org/wiki/The_Endless_Forest
It has a rerelease called "Second Decade": https://taleoftales.itch.io/the-endless-forest
Not to be confused with Deer God, a 2D platformer in a voxel style.