Somebody farts though a doorway, causing a tornado. This tornado destroys the planet, which awakens the Gods Of The Universe. An effort is made by them to create a new world filled with mythical life, while constantly being thwarted by space animals.
It looks like some sort of mythological story with elements of Egyptian mythology in it, judging by the sarcophagus in the bottom. It appears as if the moon is moving in front of the sun, suggesting that a solar eclipse is an important part of the story. The cloaked figure is likely an important character in the book (possibly representing death or the Egyptian god Osiris, as death is typically represented with a black cloak, though this might be unintentional. The fact that a sarcophagus, something also very closely related to death is on the cover, however, supports the idea that death might also be an important part of the story) though I have no idea what role the figure might fill. As for the monsters, I honestly don't know. However, following the Egyptian themes the book seems to have, it's possible that the monster that appears to be looming over the sarcophagus is supposed to be the Egyptian goddess Ammit, who was said to eat the hearts of impure people after death. I'm far from certain about that, though. The bird thing in front of the moon probably has significance, but I can't say for certain.
Overall, I theorize that the premise is that some sort of important solar eclipse is happening. This solar eclipse might in some way open the door between the living and the dead (making it the "wind in the door)." The Egyptian gods, most notably Osiris and Ammit, react to the event, but I am uncertain about what their opinions about all of this would be.