Firstly - love the site and all it does for us! Some fantastic work (and one of the best vocab resources out there). However, there are a couple issues.
The radical 中 has one answer only “middle” - yet in every other instance that it appears as a standalone (kanji or vocab) it is listed as “center”. Having congruity would be very helpful!
The biggest issue with radical learning here is… little to no consistency with Japanese. Perhaps it is just me, but when I ask the Japanese instructor at my school (I work in Japan, so I refer to the Japanese person who teaches Japanese to Japanese students) what the kanji with the two-face triceratops with a nailbat in a raptor cage is…he just stares at me blankly unless I draw them on paper and say "このぶしゅは、何のいみですか。”
In Japan, each radical (ぶしゅ) has a designated name - I think that it would be much more helpful to have radicals listed by both the correct Japanese term AND the Hipsterism. Or, at least, have the option to keep radicals entirely out of testing (as a toggled option) should we choose…
But, nitpicking aside, I have literally no genuine complaints about WaniKani. Even just the first three free levels is helpful, and the remaining levels will be fantastic (I have several friends who use the full access package - and even the advanced learners find this site extremely helpful).