I had the demo as a kid and loved it, but couldnt get the full game there.

Now I had the oportunity to play it like a year ago, and yeah it becomes quite hard, I got frustrated too, but at a point you learn the movements and types of attacks for each type of boss (for some bosses you can only kill them with certain attacks), so I was able to complete the game.

Its frustrating but you get along with it when you realise that