Minor Improvement Suggestion
In other languages the word list is provided but not in the Chinese version. It would be good if the word list for each section was listed with the rules. Especially the numbers. I was completely lost until a hover hint was available.
Write down the words, characters, and their pronounciation and translations in a notebook or notepad. I've been doing that and it helps a lot. The reason they don't have a word list is because only the original languages have that e.g. Spanish, French, German.