So, I've unlocked the golden ship, but what are the differences between it and the normal ship? Are they just cosmetic, or there are gameplay-wise changes too?
It's golden, and gives off a power-up like glow that pulses with the music. This helps quite a bit with keeping track of the ship's location, because none of the enemies fall into that color scheme.
It looks different, apart from the color. It's a bit bigger.
The turrets are a bit farther apart.