Hi there. I don’t try to post nitpicky feedback very often, as by and large I love the way the site is set up. Just had to ask why 到 is placed at such a high level (42; just checked), and wondered if it might be moved down into the early 20s in the future.
As it stands, it’s one of the few JLPT N3 kanji hanging out at a level ridiculously higher than the rest, its radicals are all taught by the early 20s, and it’s a fairly common kanji that’s even used in antonyms to some of the site’s earliest vocabulary. (Ex., the 到着 to the early 出発; even 着 shows up early on.)
It seems more sensible on the grounds of related kanji, complexity, usefulness in daily life (even for tourists; those time tables), and test-prep to move this one a bit further down. Unless there’s a good reason. And I don’t know; maybe there is. If not, just food for thought for whenever a big update happens in the future.