A field of dim lights in the dark. Touch one and it catches; what it touches catches too, and the light runs outward on its own.
You get a handful of sparks and no more. Spend one where the chain will carry itself and the whole field comes up at once. Spend one badly and you watch it die two motes short.
Sixty-five fields, each one built fresh. Walls that block the spread, then walls that move, then a pair of black holes that swallow light at one end and throw it out of the other. Three stars for the fewest sparks, which is never the obvious solution.
No lives. No energy timers. No waiting. One optional advert, on a screen you reached yourself, that gives you a spark back rather than unlocking something withheld. Plays entirely offline, so aeroplane mode turns the ads off and nothing else changes.
Touch the dark. One spark catches, spreads, and lights the whole field.