A one-button auto-runner where you flip gravity to switch between floor and ceiling, but every flip burns a charge, so you have to ration your escapes.
Your runner sprints forward automatically, sticking to whichever surface gravity points to. Spikes jut from the floor and ceiling in shifting bands, and a single press flips you to the opposite surface to dodge them. The constraint: each flip spends a charge that refills only slowly, so you can't spam flips, you have to read the spikes ahead and spend your charges wisely.
A one-button endless runner built on gravity inversion — floor to ceiling and back, a device the runner genre has used since it became a genre.
The original constraint is that every flip burns a resource. Inversion is not free, so it cannot be spammed.
That is what makes it a game of judgement rather than reflex. Given unlimited flips the optimal play is to flip constantly and react; with a budget, each one is a decision about whether this obstacle is worth it or whether a harder one is coming.
Flipshot is an original free browser game that adds a charge-rationing twist to the one-button gravity-flip runner genre, turning a reflex game into one about timing and resource management.