Credit to SpeedMann over on the Mirror Steam Discussions page for distributing an uncensor patch for Mirror. Unfortunately, each new patch needs a new uncensor patch, and the game is in pre-release and is being updated fairly regularly. Good for content, bad for cataloguing patches!
The current information here is relevant for v2.0 of the game. If this is no longer the most recent version of the game, please let me know via the Contact page!
Open the Steam game install folder (right click the game in Steam, Properties, Local Files, Browse Local Files...)
Download the patch from the link below
Extract the contents of the patch archive into the game install folder mentioned above, overwriting 'Game.ini' if prompted
Patch installed, good to go!
It's Working If:
In Daisy the Dark Elfs pleasure scene, once she is naked (or when she is clothed but you're interacting with her crotch), no flowers on nipples or bunnies on crotches will appear if the patch is working.