One suggestion - when clicking an element on the top page, you might consider treating that as "add this element to the search string", rather than as "show the search results for this element". The idea being, many users won't offhand know how to get their IME to produce characters like 亅 or 乚 or 儿, so they'll probably click on such elements, intending to then refine their search.
Edit: second piece of feedback - there are a couple of cases where katakana are used to refer to certain radicals, and it would be an easy usability improvement to alias those characters. E.g. ル→儿、ウ→宀 and so on.