Thanks for the app - just what I was looking for! I’d suggest changing ‘moji’ to ‘mora’; I haven’t heard of moji before. Have you watched Dogen’s phonetics series? (Japanese Phonetics #1: Introduction to Japanese Phonetics (Pitch-accent and Pronunciation) - YouTube) If you wanted to extend this script, you could highlight common rules in context.
For example: For Nouns Rule 1：4 mora, 4 hiragana, 2 kanji nouns are almost always へいばん pitch accent [0])
So when there’s a 4 mora 4 hiragana wanikani vocab, you could say (see Rule 1) or somesuch to try and teach the rules as well