Get gud kid. (JK) Easy mode lets u start with twice as much health as usual, and u gain alot more health per each attempt at a boss fight. The game is about reading the bosses that will try to trick u. Look at the hints at the beginningof each level and pay attention. The bosses are designed to be beatable, but hard. Otherwise its a bullet purgatory, not a bullet hel (<3)
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Every time you enter a level there is text that appears at the bottom of the screen above the death counter. It cycles through a list of hints for the boss fight. Such as for the hermes fight: one snake always lies, one snake always tells the truth. That way during the second stage of the hermes fight you can figure out which one is telling the truth and use that to dodge their devestating attack.