An impressive unique game!! I think the game begins at a higher challenge than most are used to ... one aircraft-- LEVEL 1 COMPLETE! Level 2 with two aircraft, so on and so forth. But failing at level 1 didn't completely lose my interest as many games would. If you mobilize this into Android, Apple or sell it to another company, you may want to adjust the challenge then.
I hope a rerelease comes out with monsters to avoid, evil aircraft like suicide bombers, maybe bystanders to rescue. And how about a few more background music choices?