Overall it’s really good! Some feedback:

I don’t feel the same snap as a do in the chess.com app, feels a bit more sluggish which is something I think could be improved but maybe that is due to the underlying chess.js engine?

The ability to turn off text hints was very nice also, as I think it often gives me too much information to solve the puzzle.

The placement of the board theme button was unexpected, I would have expected it to be a part of the other settings and is pretty different in functionality from the other buttons in the same container.

You managed to squeeze in a lot of information on the screen in a tasteful way, nicely done. Some small improvements that could be done but I got the unlimited version right away either way to show support

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Imprecise Spice