Your UI is very difficult to use.
The upgrades menu takes up the entire half of the screen, and it is closed by clicking the laptop. But you have buttons on the top where the "close window" button usually is. The laptop gets hit a bunch while dragging coins. I would just have it open and close from the top.
EDIT: Oh, gosh. The button is responding to my MOUSE pointer, not your custom created pointer. This drove me crazy the whole time. Whe you have to click on a small area, and the hand is covering what you need to click on.