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.