Any idea what the right-side toggle does? The lack of tooltips in this game is astonishing.
EDIT: For others, the info: appears that when you get to unit/stage 100 and die, you get a prestige currency, tracked as the purple-and-grey spool-like icon in the top-right. The toggle in the bottom-right perhaps skips the prestige interstitial UI and returns to the grind when you die?