In the final message, the author says that the reason the manga is 8 pages long is because he keeps going to the hospital with an illness and having to work as an assistant to cover the costs of medicine.
Regarding the reason the characters don't have mouths and noses is because the manga was made for Comiket, he felt free to create more simplified art in the way he wanted because he wasn't bound by publisher rules and because he thought it would draw attention.