Definitely not a RPG, although it has RPG elements(leveling, items, that kind of shit). It's a beat em up/side scroller. In some ways similar to the old Castlevanias(the NES/SNES ones, not the DS metroid-like ones) or Ghost n Goblins. I really liked it, but yeah it's repetitive, like most games of this genre it has not too much content and is mostly extending it via replayability. In this case, you don't replay the exact same game with different characters, each of them has its own story and the levels change and stuff, but the regions are the same for all of them(so all of them go through a forest, a mountain, a lava level and so on and they all have the same mob types and bosses, but the final bosses have different movesets). Story is also polarizing, it's like fairy tale storytelling so it's not deep or "real", but I liked the various stories and how they fit in the overarching story. You sadly don't get to choose the order in which you play the characters and some have very meh playstyles.
I don't regret buying it personally, was well worth the price, it was iirc 40ish hours, and I really liked it, the gameplay was solid, the story was nice, the art is fucking crazy good, both music and graphics. But I wouldn't put it in this thread, other than there might be some overlap in the target audience.