What a fun idea! I love that the song doesn't have to be programmed in by the developer. Will give it a try.

Have you played the Rock Band and similar "rhythm games" that were all the rage in the Wii era? I don't know that it helped my singing per se but gave some incentive to practice.

In case anyone is interested, you can test your relative pitch perception (as opposed to producing the pitch) in this excellent Yale site: https://www.themusiclab.org/quizzes/td I got 15th [sic] percentile!