Airstrike HD

At ease, pilot!
Your goal is to destroy all buildings on the mission and defeat all Bosses. One combat operation includes 5 levels and 1 boss mission. The aircraft will lose altitude with each descent, so be cautious! The randomly placed bonuses on different building storeys might boost or hinder you during the bombardment. If you find such a Bonus crate, try to hit it before it’s gone. If a bomb hits the Crate, you get one of the 10 bonuses.

Features:

5 combat flight operations
5x5 levels
5 aircraft types
5 tricky bosses
5 good and 5 bad bonuses
5 languages
Hardcore mode
Unlimited fly
Weather affects the gameplay
Achievements and cheats

And, of course, a secret level with a seagull!

(from Steam Store page)