When it follows the path of the Ninja Gaidens and all of the various linear action platformers before it, this game is unbeatable. Responsive controls, excellent music, and great level design fire on all cylinders.

Once it becomes a Metroidvania style adventure, and you're forced to comb over the entire game's levels over and over again it becomes a huge chore. Finishing this took a substantial amount of effort and quite a few joyless hours.