Touch to dig that way. Lift your finger and you stop, and cool. That is the only verb — there is nothing else to learn.
Past 60 heat, wear runs up to 3.5x. But some rock only opens when you're hot. It isn't a line to avoid — it's a resource you pay for.
Die and you still keep the whole haul. The game refuses to manufacture tension by confiscating it, so the only question left is how you dig. Depth is a finite staircase, wealth is an endless pile.
There's one thing to learn: let go. Depth teaches the rest.
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The same "let go" comes to mean five different things.
Two equipment slots. Pairings matter a lot — the best combo runs 1.66x, the worst 0.25x (measured in automated play).
Playable on a keyboard too (Space to dig, arrows to steer, Esc to pause).