Thank you for your feedback! Difficulty balancing (As you can see from pretty much every comment) was a real struggle for me. I got too used to the game I was making and balanced it around me and not a stranger. I have a lot of ideas to expand on this game and I wrote the code to be pretty adaptable. So when the competition is over, I'll definitely revisit it. Current planned features are difficulty selection, in speed, spacing and words, and a larger vocabulary of words. Also I plan on implementing the coins in the game rather than just giving them at milestones. Additionally probably some palette swaps and other cosmetics.
As a language learning tool is interesting, because I feel like its hard to find addictive educational games, especially in the typing category. Epistory and Typing of the Dead are really the only games that I know of. Another comment is somebody that speaks English as a secondary language so I also have to account for people of different backgrounds that I didn't plan for when making the game.
Once again thank you for your feedback!