Story - Pretty simple story, but it executes it nicely and sets the game up perfectly for the gameplay that really shines!
Mechanics - Flying the plane was nice and calming. Until I decided to fly through a ring and get jettisoned straight into a rock LOL. Overall, the resource balancing, flight simulating, ring zooming mechanics all work harmoniously together. It would be cool if there were little things to do in between the flight between towns. Maybe little narrative moments that pop up over the radio or something to give players something to do during the downtime.
Theme - Pretty spot on. Generous old war pilot decides to help struggling communities in the best way they know how. I can dig it!
Audio/Visual - Really simple graphics, but I think that helps the vibe of the game remain extra casual.
Overall - Cool game with a great premise. Would love to see this expanded upon! Great job!