This is really cool! I just applied. I live in a moderate sized city, so I do walk a bit. I hope to help you out on the iOS side of things since lemmy is very android heavy.
I really think this will motivate me to walk more, as I really only walk to work and the store when necessary.
Right before I left my last job, we were looking at using Flutter to dual deploy our app so I’m excited to see it in use by an indie dev!