Lunar Helium-3 Extraction: Depth, Heat & Power Budget (2D)

The 3D original drives a sci-fi rover in an endless circle over a cratered lunar surface, with a "yield" counter that ticks up at a random rate whenever the rover happens to be moving — depth, temperature and power are exposed as GUI sliders but none of them are wired to the number that matters. This 2D companion builds the real mechanic the title implies: an excavation depth that dilutes the average trapped He-3 concentration the deeper you dig, a heater temperature that drives a sigmoid thermal-release curve, and a solar-elevation-limited power budget that caps how much regolith can actually be processed per second — push the target throughput past what the array can supply and the process visibly goes power-limited instead of just looking busy.