Minimalist Run: Like Giga Wing 2 by the same developer, your Score Multiplier starts off at 0. As such, you can complete the entire game with zero points as long as you avoid picking up any gold.
Polished Port: The Dreamcast port is hailed as this for primarily one reason: The original arcade version can have the score maxed out (Not a good thing for an arcade shmup) by a good player, so the port adds 2 extra digits to the score counter.