i didnt get around to finishing this so all you have is the button and upgrades. Click button, click upgrade. You can also use space to click the button but you should really click it instead
Display mode changes how big numbers are displayed (mode 0: 10,000 = 10K / Suffix) mode 1: 10,000 = 1e4 / Scientific) mode 2: 10,000 = 10e3 / Engineering)
