Points per click, points per second, and two things nothing else here has: bombs and explosions. A bomb ticks down and pays out eight points, an explosion pays sixteen, and ranks cost thirty two and raise everything.
The whole game fits in one paragraph of text on a plain white page, which is what its author promised. It is a genuinely small thing done cleanly rather than an unfinished large one, and it is over in a quarter of an hour.