Yeah, that's how it was for me. I could die a couple of times on bosses, rarely did otherwise, but I was at low health for a good portion of the game. I think I only had about five, maybe six, hearts at the end, too. It wasn't brutal, but I thought it had a solid difficulty level. I enjoy it more than I do the Super Meat Boys of the world.
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Knowledge is the eye of desire and can become the pilot of the soul.