The difficulty ramps up very quickly after the first few boss fights, and demands nimble figures and smart thinking to proceed. (eurogamer.net)
There were very few boss battles, and the final one seemed a bit overly difficult compared to the rest of the game. (gamingcypher.com)
The first few bosses are pretty easy but past that the game does pick up the difficulty level and make for an extremely challenging experience. (darkstation.com)