On the other hand, it seems ... profane to crack the brilliant Symphony of the Night open and repurpose it in this manner. Maybe it's just us, but seeing Symphony of the Night's sprites and plot reduced to motivation for matching blocks makes us squirm a bit. We wouldn't be so offended if it weren't such a highly revered game -- even if it were other Castlevania. Castlevania Bloodlines Puzzle would be weird, but not offensive.
We must keep in mind that the existence of this game in no way impugns the real Symphony of the Night. We should also remember that this is hardly the first Castlevania game to reuse sprites from another.