Thanks everyone for your support!
@AaronStocek: Yes, the “playlist” feature is on my roadmap. I discussed it in more detail in this thread. In that thread I was hopeful that it’d be something I might release this year; 2021 is looking more realistic at this point but we’ll see!
@MonikaDewar: 9 chords are not too much to ask! They’re in the plan. 
@Ellie: Well, if you have a Bluetooth keyboard connected to your iPad you could always use that to start/stop the song; it’ll work even in the app. As for the search bar, I’ve heard that idea a couple times but I am hesitant to add yet another button to the interface. That said, currently you can press the / key from a song page which will bring you directly to the index page with the search field focused so you can start typing. Also, you might find this list navigation bar feature useful.