What is "Prisoner on the Hell Planet"? How is this comic different from Maus?

Vladek is in the garage sorting nails, clearly upset. Art, feeling guilty, asks whether he can help, and his father curtly declines any assistance. In the kitchen, Mala tells Art that his father recently found a short comic that Art wrote years ago called "Prisoner on the Hell Planet," which told the story of his mother's suicide. In the comic, which is reprinted in full, Vladek arrives home to find Anja in the bathtub, her wrists cut and an empty bottle of pills nearby.