Idle Miner Space Rush takes the mine-and-upgrade loop off-world: you extract resources from asteroids and planets, haul them back, sell them, and spend the proceeds on faster drills, bigger cargo holds and better ships.
The space setting gives it room to escalate — each new location is richer than the last, and reaching it is the reward for the previous grind.
Usually transport and cargo capacity rather than mining speed — a fast drill filling a small hold just means more waiting.
Yes — it's an idle game with offline earnings to claim on return.
Yes — it runs in the browser with nothing to install.