I did something similar back in 2019 but for learning Dutch with games, which I made originally for my child but this kinda helps me remember many A2 words and helps me with the exams. Now I have the Dutch citizenship.

Not as extensive as the site but with the images, interactions, it helps with remembering the vocabularies. https://play.google.com/store/apps/developer?id=Joel+Bryan+J...

Very cool! I really need to work on my mobile development skills.