its so damned frustrating...sometimes you can just make it out alive if you have some luck but sometimes you will want to smash the game to pieces.
eg. in one area you have to kill 10 super ninja's and 10 more minor ninja's then 3 of the biggest red demons you have ever seen and then you are treated to a lovely cutscene and then just when you have no health potions left you get a giant boss who does maximum damage to you no matter what.
and trust me i tried this even when i had lots of health thingees with me...but it is a good game i suppose.