Don't feel dumb, it's not intuitive. I was planning to put a big "click on the coin to spin" in the middle of the board, but time was running out so i didn't do that.
I've thought that it wouldn't work as a mobile game since the big part is seeing the coin clutter. But now that i think about maybe it'll work if the focus shifts to the tactile and sound feedback. it would be nice to feel the vibration as you spin the coin.
Also, good point about dragging! I'm thinking in the future i'll make it so you can click and hold on the buy space and coins would fly in one by one. It does have a design purpose of keeping the player busy and giving another choice of "should i just farm coins, or should i go for another buff"
Thx for playing!