The ending reminded me a lot like NT's gave, Enslaved. Humans are kept in a virtual world by a guy who thinks he is helping them, but the humans live in an illusion. The man argues that even though humans live an illusion, they are happy and safe.
But, Trip takes the humans out of the virtual world, and the humans are left with uncertainty. Illusion is what they know all their lives, so would they be able to live without illusion?
The Pyramid guy reminds me of a less angry, aggressive Mundus.
Mundus thinks humans are unable to handle freedom because when they get it, they turn on each other; citing the death of his child as an example of what humans would do with freedom. So he thinks keeping them under control his the right thing to do. He thinks that he is helping.
Then there's the whole idea of humans living in a lie. Once Mundus is gone, the way of life humans have always known is gone. Would they know what to do when all their lives have been a lie?Would they do what Mundus said, to kill and starve and start war?
They are now exposed to what could possibly be a worse danger: demons in their world and a void left by Mundus' defeat. Who would replace him?
It's a good ending, one that raises many questions about real life. It's pretty relevant to what we're going through now.