I created the game in Godot using .NET and C#. I found it made it easier to pass classes and instances around using event / delegates than gdscript. Linq is also quite handy for list iterations etc.
I have experienced this for simplified Chinese. I studied some Chinese while studying computer science in China. The classes would have us learn writing, reading, speaking and listening (sensibly so for a Chinese language class).
Being able to write characters was handy whenever I came across documents that needed to be filled, but since leaving China I never had the need to write characters again. I now just input them using pinyin on keyboards, and I can easily recognise and read / input the correct characters. It is a strange feeling trying to write the characters I once knew, but now have forgotten, yet being able to read them instantly...
I would like to recommend dong-chinese, a language app I came across when I prepared for my stay over there. It taught things in a very efficient manner.
At this point I would like to recreationally increase my vocabulary so I have started working on a game called LingoRogue. My goal is to make it addictive to play, with a sneaky vocabulary-increasing effect. In other words a game that is "learnified" rather than a learning software that is gamified.
Just my two scents: I find the font incredibly hard to read.