I have been having some trouble figuring out some of the endings and have not experienced the ending plus stuff. There is one I am aware of but have not tried it yet (accept offer upon loss). Just need some hints don't need spoilers.
What they said, two endings are literally a matter of choice with the cocoon, one is from the loss, and one has not been implemented yet (This is just the one's I could find from the game's code, but I won't say much else out of respect for the developer)