Gameplay
Deep Blue is a basic horizontal scrolling shooter: players collect power-ups and different weapons to fight numerous enemies. The screen scales up and down allowing more vertical space.
The game features a single life; the Angel Fish can take a lot of hits before it is destroyed, and even regenerates over time. Damage levels are represented by the color of the ship's 'eyes': they start out a solid blue, but when damaged, the eyes blink blue until going to green, then yellow, then red.
However, taking any damage will momentarily paralyze the craft, remove any speed power-ups, reset the weapon to the defeat Pulse Bullet, and remove one weapon power level.
Read more about this topic: Deep Blue Kaitei Shinwa