I managed to get to Act 6-2, the game's difficulty is becoming very cheap. Around Act 5-1, the enemies started to spawn more, with an increase of re-spawning from the same exact spot upon death. The birds, bats, and jet pack ninjas are really out of place, not only that, but they are extremely annoying, nevertheless. Enemies who shoot projectiles are unfortunately placed on platforms that cannot be jumped on and attacked simultaneously, all enemies are conveniently placed to the point where I can't really navigate the stage because of their never ending projectiles. It's amazing how wonderfully aggravating this game is, I'm surprised of how close to each other, Ninja Gaiden, and Ninja Gaiden for the XBOX are in difficulty.