I would love a small visual indicator of which words were valid/invalid on the board. Maybe something as simple as valid words having slightly green letters, and invalid words having slightly red letters. Or a subtle little sparkle effect around letters that are part of a valid word.

Especially when I'm having to read my entire opponent's board upside down, I find parsing which words are valid/invalid to be a time-consuming, mildly frustrating, and not super fun aspect of the game.

Maybe that takes too much of the challenge out, but I don't find it's a part of the game I feel like I should have to be good at.

Other minor feedback:

- There's no cursor or focus indicator on the search box in the dictionary.

- The dictionary should open auto-focused. If I click "open dictionary" with the mouse, and start typing nothing happens. I have to click on the "search" box before I can type. This is especially annoying given the lack of feedback from the above point on the search box.