OK, so the challenge of this game for me is not to confuse buttons (on every try I did blink instead of magic attack at least once), and the fat monks (whom I accidentally bumped right after the first magic attack a lot of times). The boss itself, unlike its ever-arriving monks, is pretty useless with its sparse tentacles and eternal waiting to be punched.
The fights before the boss can be skipped for sure, all you need is in chests (all destroyable without ever stopping moving), and by stopping you only lose your health/blood (high chances that by the time you arrive to boss you'll have *less* blood than if you ignored all the people before the boss).
Also probably the extra purple health could be made just regular green, because it's practically the same, and is only confusing when of different color.
On the bright side, the world feels alive - monks killing other people, beautiful layered backgrounds, some animations are cool (magic attack, crates crashing), and I liked the color palette. Keep it up! ;D