One person reads this, and they wrote the game.
Email playpuzzled@proton.me. It is read by a person, and that person is also the one who wrote the code, so bug reports go straight to the right place.
The two things that help most are what you were doing and what browser you were in. If it happened during a game, the four-character room code lets the exact board be looked at.
Feature requests are genuinely welcome. A good deal of what this game does — the per-player shuffle, the pause that blurs the board, being told when someone else is already holding a piece — exists because somebody asked for it.
Photographs come from Pexels and are credited to their photographers. If you are a photographer and want an image removed, email the address above and it will be taken down promptly.
To ask what data is held about you, or to have it deleted, email the same address. What is actually stored is set out on the privacy page, and it is very little.