Reduced motion is enabled on your system, so Bend does not animate.
Move your pointer, use the arrow keys, or press and drag on a phone. The brighter ring follows your pointer with a slight delay, and it pushes photons away from itself — so place it beside a photon, not on top of it. An aiming guide helps for the first seconds of each run.
Every falling photon shows a landing mark on the gate ring — that's where it will land if you do nothing. Steer the mark into any gate to catch the photon. A gate of the photon's own color scores double. The gates drift at different speeds — when two overlap, a catch there pays both. Catching quickly builds a ×2/×3 multiplier; it fades if you stop catching, and a flare resets it.
There is no clock — the run lasts as long as you keep the sun alive. It cools slowly on its own, and every catch cools it more. If it overheats, it flares, and the run ends. Photons come faster the longer you last.
A side project. The research is here.