The mechanic
Every cut you land makes the next one harder to catch.
A single shard sweeps around the crystal ring. Tap while it sits inside the lit arc and the ring takes the cut. Then the arc grinds narrower and the sweep runs faster, so the moment you are aiming at gets shorter every time you find it.
Best run to date, 0 facets. Runs played, 0. Day streak, 0. Continues in hand, 0, and shields, 0.