I've finally played all three GBAvanias, and this one is easily the best out of all three. It has a few flaws, but combines the good parts of its predecessors and is the only GBA Castlevania I'd seriously recommend.

+ Movement still feels great
+ Lots of different weapons to use
+ Soul system is a great idea, and is executed very well
+ Zero filler content
+ Graphics and sprites are a major upgrade from the other GBAvanias
+ Music is mildly catchy and is a significant step up from Harmony of Dissonance
+ Actual good level of difficulty

~ Story is kind of weird, and the "power of friendship" theme doesn't really work in a series as dark as Castlevania

- Final boss kind of sucks
- Surprisingly short. I suppose that's what happens when you don't have filler content, but still, this is the shorted of the GBAvanias by far