I made a free browser tool that animates a photo along arrows you draw (WebGL flow shader)

I made a small browser tool that animates a photo along arrows you draw, and I'd like feedback from people who know shaders. Each arrow becomes a Gaussian pull in a WebGL 2 fragment shader, so pixels near it get displaced along its direction. Two copies of the photo slide along that flow half a loop apart and cross fade, which hides the reset and closes the loop. A freeze brush paints a mask that sets the flow to zero. The GIF writer keeps one palette for the whole loop and leaves unchanged pixels transparent. It's free, no account, no watermark, and the photo never leaves the page. MIT licensed. Live page: https://arthur031221.github.io/OohAlive/ Source: https://github.com/Arthur031221/OohAlive Only tested Chromium so far. Which photos make it look wrong?