Circle of the Moon is decent metroidvania style castlevania, that suffers a bit every now and then from the limited screen size of gba / level design, in that things pop up way too fast to react at times. Otherwise it's a solid metroidvania. I wasn't a big fan of the boss design this time, half of them I just had to give up and find a way to basically cheat my way around with some spell cards and blind spots or such. The dual spell card system in general wasn't too great.