Axelay/Stage 4

The fourth stage is in an underwater cave.

Boss
The enemy starts at the top of the area. The cavern will shake for a several seconds, causing rocks to drop fro the ceiling, before the boss itself drops.

There are three attacks:
 * A lightning attack from the upper-left extension. When you see or hear the purple glow, you can move to avoid being hit, although this lightning beam will only change your weapon, and might not be worth dodging.
 * It will release enemies from the bottom, which will fly around the arena.
 * When low on health, it will shoot additional shots from the blue spots above and below the core. If you are in line with the vulnerable point, these shots won't hit.

It is vulnerable to attack on the front, by hitting the red core.