I also found your game to be top in karma!
I think your idea is really inovative. Loved the visuals and enjoyed playing your game.
When first playing your game I bought a big bag out of the money from the tutorial gem, stashed my bad detector and inspecter in it and didn't know how to get them out of the bag. Then I traveled back to the hub island, bought new ones, traveled back to the other island to collect treasures and landed there completely itemles : )
So when my brother atempted to play your game he just took all the items from the tutorial, didn't buy a bag, and traveled right to the main island to start digging. He always took his chances to get a gem, but ended up digging 1 scrap, 2 crabs and many many mines.
So all in all a great experience!