Fun concept and art style!
If you don’t mind feedback, I had some UI complaints: the textbox text constantly changing size/wrapping was very distracting, and when I was dragging a chess piece, I expected to drop it so its base would land on the target square, but I guess my finger had to land on the target square instead. On mobile, I didn’t love having to zoom in and out of the different times - it would be nice to always have one board centered, but with a timeline that lets me switch or scrub between which time period shows.
Keep it up, this is fun flavor and an interesting game!