La-Mulana is not the kind of game willing to simply give you it's secrets. La-Mulana is not the kind of game that expects you to earn it's secrets, either. In truth, La-Mulana doesn't really care what you give it to get it's secrets, because for La-Mulana, it will never be enough.
La-Mulana doesn't want you to have it's secrets. La-Mulana doesn't think you DESERVE it's secrets. If you want La-Mulana's secrets, you're going to have to pry them from it's cold, dead hands.
That's right. You're going to have to kill La-Mulana.