This looks great- I'd give it a shot.

Marketing note: I'm pretty sure it's regional, but in the very densely populated place I grew up, lungy was a synonym for loogie, which if you've never heard the term, is phlegm mixed with saliva forcibly spit at someone or something. Unfortunately, I just viscerally find that name pretty repulsive through some deep-seated associations that would be pretty stubborn to rewire and that would probably work against the app's intended function. I'm not sure how wide of a region that's true for, but like I said, it was a very densely populated part of the US.

This isn't a criticism, it's just that I'd want to know that if it was my app.