What a sweet little game, I very much like the concept and art, and "golden retriever" is a very creative use of the theme! Very tasteful vibes here. I mostly found coal and bones but I did manage to find 1 gold!
I like the little details like bones span across more than one tile so you can unearth them in multiple places. And the detail of making him play with bones to waste time is very cute, I enjoyed it.
The tutorial at the start was also very nice. I didn't need to resort to reading the description, it was all very clear.
I wished that there was a possibility to play for longer, perhaps if you find gold you can dig up another garden for another minute. Maybe also an ability to "sniff" that shows the strength of the nearest gold, but sometimes he just sniffs out bones.
There are a few areas that need polish, for example I found the controls to be very awkward. I also think it shouldn't be possible to walk over dug tiles as it looks a bit strange when you do.
Overall a fantastic entry, best of luck!