BlinkDas:

A silver gust rolls across a meadow and weaves moving ripples through the grass. There is only one action: tap the screen to freeze the weave.

The pattern keeps cycling through three looks:

Forming: The ripples are incomplete and uneven. A tap here fails.
Aligned: The lattice is most regular and left-right symmetric. The hint reads The silver lattice is even and the center rings settle. Tap here for a perfect freeze.
Chaotic: The gust tangles the grass. A late tap fails.
Scoring:

Perfect freeze: You score, combo grows, and a faster gust begins. There is no final stage; the run continues until you mistime a freeze.
Early freeze: Broken, incomplete weave. The run ends.
Late freeze: Tangled, chaotic weave. The run ends.