I agree, Castlevania Circle of the Moon is amazing game with but for me there are 1-2 very bad things.
The worst thing about this Castlevania is that there is no bestiary therefore you do not have the knowledge about the monsters you are fighting. You cannot see if the monster you are killing over and over has an item to drop. There is not even a single line to support the monsters in this game.
From all 3 GBA Castlevania games only Aria of Sorrow has the best of everything.
CotM - No bestiary, no drop chance therefore you have to llok into sites about those things.
Harmony of Dissonance - Has bestiary and drop information but no explanation about the monsters! (WHY?!?!? It has the space for 1-2 lines!!!!! WHY?!?!?!) Also NO NEW GAME+ WTF??? This is the killer for me. I collect all 100% of the items and for what? To NOT be able to replay it with them?
Aria of Sorrow- Got everything right. New game+ just not with the core game advancing souls and abilities. Beautiful bestiary with drops and cool info.
I just with someone make a hack of HoD and CotM just adding those stuff in.
PS: The soundtrack is a killer!!! (Awake + Aquarius = WIN!)