From GameBrew - a wiki dedicated to Video Game Homebrew.
Blitz is a port of Blitz, a VIC-20 game released in the late 70s/early 80s. The original game was based upon the German bombing of London during World War 2 (The Blitz) where you were a Luftwaffe bomber pilot. The plane has been modernised in this DS port version.
Fly a B2 Stealth Bomber and bomb the city. You lose height on every run, you have a limited number of bombs and can only drop them one at a time.
A - Fire