The scrollbars are bugged. The scrollbar does not shrink down to the proper size when changing screens. This is especially noticeable going from the settings to the upgrade screen.
The easiest way to find the golden treasure chest, is to pick a space in the corner. Then for your second pick, take something on the edge of the screen however many spaces away your first pick was. This won't always tell you exactly where the golden treasure is, but it does work the majority of the time.
This game really needs a way to automatically retry a level after you die. Having to move between mouse and keyboard after every death at least tripled the tedium and frustration of the last level.
We're switching to text based numbers for large values!