This was exactly a game for me. I had fun exploring around for everything. It was fun looking around like "hmmm, I feel like there's something here" and then there was! My biggest gripes are that some of the ground tiles are hard to interpret, so I didn't know I could step on certain things until I did by accident, and it's pretty easy to get turned around exploring for treasures. A map of some kind would be incredibly helpful.
You did a great job with a lot of the treasure items though! Most of the time when I thought there would be an item, there was, which was neat, and you made the dig radius pretty generous which keeps it from getting frustrating, since if you solve the puzzle it doesn't tend to matter if you aren't standing right over top of it, so I liked that a lot!