Score system:

every damaged part of Boozoid from bomb: +100;
Boozoid drops down from island: + 100 * xx, where xx increases for each part to 0.5;
Boozoid drops down from island & no have damage: Flawless kill +250;
Boozoid crashed about aircraft: Gotcha +250 (Flawless Kill can be added);
Boozoid flew far away into the sky: Into Space +250 (Flawless Kill can be added);
Time bonus decreases every second and added to scores after the completion of level.