The gameplay is frustrating because it feels like you should have some sort of level system like other Metroidvanias, but instead you arbitrarily gain new whip combos. Most areas have Tom and Jerry syndrome--repeating textures that ruin potentially interesting environments. The voice acting is bad, but not in a charming Symphony of the Night way. You have a plethora of elements to use with special weapons, but there is no need to use most of them at all.
That said, the soundtrack is awesome. It was composed by the same person who made Symphony of the Night's soundtrack. I say the LOI OST rivals SOTN's. Though I don't like how the character grows in terms of gameplay, the combat is fun even though it is repetitive. Though not nearly as expansive as the 2D Metroidvanias, the secrets are satisfying to find. They actually almost got a 3D Castlevania to work, and that's impressive. I love the character designs and artwork. Again, they got the same person that worked on SOTN to work on LOI. Absolutely stunning artwork. Besides doing a playthrough as a boss character, I basically did everything there was to do in the game, and that's very rare for me to bother with. Also, this game was meant to be one of the many origin stories of Castlevania and it was a HELL of a lot better as the other one that came out in 2010 or so.
Plus, the game reminds me of a pretty tough time in my life. Lots of things were going wrong, but when the game was new, it really helped me get out of a funk I was in.
Anyway, here are a couple of awesome tracks! Give the first one a chance to pick up. TOTAL CASTLEVANIA music, man. Love it! The second song would seem like it is out of place, but it's just a fun beat!