So far, so good, but . . .
My only suggestion is that a map “key” should be available - especially for new users. I found some areas outlined in black and couldn’t find an explanation for the meaning.
I checked the burger menu for a map key, but there’s nothing. If you drill down to a specific location, you can see a color coded bar but that doesn’t help you at the map level or explain the black outline.
Aside from that, I love that this app is not trying to do too much. I’ve found apps break over time because developers try to do too much. This app is intended to get better as more people use it and share their experiences.