The adventure can be read in a dark tone (the poor dead family, the disturbing visions, the madness), or in a comedic tone (the alpacas as cruel overlords using "being fabulous" and "cuddling up" tactics), or perhaps a mix of both! Ultimately, it's up to the GM.
It would be a really fun ending if players overcome all of this by somehow powering the ship with the alpaca demigod's energy.