Just a suggestion: After each phase of the fight, have the game refill your health. Other than that, it's a great game.
Defeat the boss! Melt his heart... with your sword!
More games: BoneVolt
◄► - move
Z - attack (you can destroy projectiles)
X - jump
After each boss phase you can select an upgrade!
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One of the upgrades restores your health and gives you one extra heart, maybe it didn't appear for you..? It's 3 out of 5 chance of appearing. Either way I think you have a point, starting a harder battle with less health can be frustrating. I might rework that in a later version. Thanks for the feedback!