Thanks! I can add it into the rules page in the next patch. :)
There's no “game over” screen yet - I’m working on one that will only give you a game over if you don’t have enough resources to farm yourself up to any more lives, and tally up your total score so you know how you did. I’ve put a small “Back” button in the lower right corner of the screen as a temporary hotfix (effectively a reset). Please be careful, because you will lose your progress upon returning to the title screen!