Osamu Tezuka is often regarded as the "Father of Anime". He introduced the world of cartoons with big eyes and small mouths that still lingers on to this day, which ironically enough was inspire by the American works of Disney and Max Fleischer (at the time they were big in Japan).
However, none of those traits are present in the various independent shorts that Tezuka directed, including this one. The theme of the short, war and destruction of mankind, is fairly common in Tezuka's works but it has an interesting style that makes it worth watching. If it wern't for the credits no one would guess that Tezuka did this.