Maybe it's just me, but this game isn't talked about much here (though that might have been the case in the past, I'm not sure). Anyway, I've been replaying the original version. I'm at the 4th loop now. The game keeps getting more difficult until the 8th loop by changing the enemy AI (for example, during my current loop, the zombies in the first stage slow down and suddenly charge at you), which is really neat.
I also notice how each segment of every stage has at least one memorable segment visually or level design-wise. There's the creepy vampire painting, the green slime that you have to whip in the caves, the mysterious druid character who gives items, the giant snake monster that you have to jump over, the glass-knight, the crying goddess statue, etc, etc. It's pretty fascinating how diverse the game is.
The game can be a bit obtuse difficulty wise. Although I played through it several times, there are still certain sections I feel I haven't mastered yet. Good luck dodging the attack from the second stage's boss, or those rotating blades from the fourth stage. The rest of the game has fair difficulty, though.
All in all, it's not as innovative or distinguished as Rondo or SCIV, which makes the appear a bit "boring" in comparison, but it has a lot creativity and mostly great atmosphere. I should also mention this game has my favorite version of Vampire Killer (the original version, not the Arrange remix).