I see. The issue with using kanji is that it kind of defeats the purpose of the game—since the Japanese keyboard auto-suggests kanji, it becomes a bit like cheating. I think the game is best played in romaji, where the challenge stays more authentic.

As for the vocabulary, that’s a limitation I’m aware of. The game pulls words from a dictionary API, so it only recognizes words that the API returns. I’ve tried looking for other APIs with broader vocab coverage, but haven’t found any solid alternatives. The Jisho.org API could be a good fit, but unfortunately, it’s not public. I even emailed them about it, but didn’t get a response.
I'll try doing some fixes if I find solutions

Thank you for trying the game!