Thanks so much for trying the game!
It is a shame how much didn't make it to the game, I only just finished the gold making part on the last day of the jam so I didn't get to add objectives, narrative, feedback and quality of life features to help steer the player.
That is very strange if you did GY and it came out with gold, I just went to try to double check and it resulted in Lime, like this:
The only bug that I'm currently aware of that could end up with that kind of result is you can transmute some colours, then transmute different colours during the transmutation animation, and it will result in the ingot being the result of the second set of colours.
And yes, I've had pretty much everyone who has played this game tell me that they thought the dogs were being turned into metal xD