Big fan of the aesthetic here. The mix of dithering on the portraits and bold, solid colours on the UI and the spirals works very well. I love the portraits in general - the way the facial expressions change, and the diversity of the character designs. And of course the spirals themselves are very pretty, yes. The sound design is good as well, although I found the background music a little repetitive (I eventually muted it.)
Initially there seemed to be a little trial-and-error involved in figuring out what the clients liked vs. what they didn't, but in most cases, I was eventually able to figure out the pattern. There were a few fun little puzzles in there. Good work on those!
The Linux build seemingly doesn't want to work, but thanks for including one.