I want to begin by pointing something out:

F IS GREEEEEN!! I knew it!

I am honestly amazed at how you managed to pull it off. Feels amazing to bring an idea into reality, doesn't it? Also, I like the concept of bringing synesthesia into a wider audience, since it helps associate and distinguish sounds - seems ergonomic, in a way I can't really describe

Your story reminds me of a saying about "no prophet being welcome in their hometown", and to be honest, I faced a lot of discouragement from close people as well. I'm glad you pulled through it in one piece, and transformed your idea into a reality.

You got my upvote & follow!