Iron will

A 2D Metroidvania game in which the player takes the role of a human hero who survives the Middle Ages and travels to Hell with a human body to kill the demons cleanly in order to break their curse on his brother. Meanwhile, wars are raging between countries, and in order to capture more land and benefits, some countries even borrow the power of demons and make pacts with them, promising to give sacrifices to the demons, but the demons are plotting much more than that...