Thanks for playing the game!
It seems like the tool bar is interpreted as an inventory by many players. I need to make some changes there. I did not get around to making in-game playing instructions which I prob have to add later. Adding "Sell All" is a great suggestion, I'll add that so the player don't need to do those tedious clicking 100 times to sell 100 stones.
About the sand idea. I'm a bit confused if you want the sand to be disabled entirely or if you did not read the how to play instructions? The sand spreading and the counter action of this is basically what the entire game revolves around...