Nice. I assume you've seen the Sudoku puzzles at Logic Masters Germany? Heavily reminiscent.

One suggestion, and maybe I'm just holding it wrong: when I started the daily puzzle, I had to scroll down to read through the rules, which I assume starts the timer while I'm still learning the symbols. It would be nice to have an interim page with a summary of the symbols so the timer doesn't start immediately.

Hah I completely agree! I actually already had that on my task list, I'm adding that exact feature to both the webapp and mobile version this weekend.