I don't know what kind of string manipulation options unity gives, but the numbers could use commas. By the time the nuclear war option is unlocked, the difference between before clicking it and after clicking it becomes invisible.
Hey Colin thanks a lot for trying the game and for your feedback. Yes, the next thing I would do is probably make custom formatting, i.e. "k" for thousands, "m" for millions and "b" for billions. And I'd start with adding commas, that's a great idea. Thank you!