I gave it a spin. It's an enjoyable little romp. The best thing the game has going for it is the planes: I'd love to have a better feel for how different planes affect the outcome of a mission. The combat is fairly basic, but it's obviously not the key part of the game.
Having flown a couple mission and made my way through maybe 14 combats, I don't have much idea what I'm doing. If there is some way to make the outcomes of each combat a bit more "shades of gray", that'd be great (e.g., chase off an enemy plane vs. badly damage an enemy plane vs. shoot down an enemy plane). If I'm able to make choices in combat that balance difficult trade-offs, then the combats become much more gripping and the outcomes more rewarding (when I score a key win) or upsetting (when I go down in flames!).
I like what you have so far.