The game is honestly not that bad. It is definitely plagued by feeling very slow and having some pretty challenging jumps that are kinda hard to tell if you will make it, but it is otherwise a pretty short and straightforward game. The bosses were kinda cool since all of them were new as far as I can tell, and the last two levels were pretty well-designed. Stage 3 in particular was really cool, since you are constantly running away from spikes that are coming from the walls or the floors, making it pretty intense. That being said, it's not a bad portable Castlevania game, just not one I'd say is that good either.