Really nice however I've found some bugs that I'm not sure you know about.
Those that i found include:
- When you write multiple of the same letter and there is at least one of them included in the word all of them will be in yellow.
- You can write during the start animation (unrelated, but it would be nice to be able to skip it).
I would also like to add that maybe you should do a visual representation when the letter isn't included in the word because right now it isn't very clear.