Somnium Files is so absolutely laden with wordplay. it centers around eyes, and AI, which sounds kind of like "a eye." "ai" is also the Japanese word for love, which is also mentioned. like you noticed, "AI-Ball" sounds like "eyeball." incidentally, the AI's name is Aiba, which also sounds like "eyeball." one of the main character's names is Iris, as in, part of an eye. her name is also connected to the winter iris flower, as well as the Egyptian god Osiris. there are a lot of references to Egypt, actually. the AI system is called Wadjet, which is the left eye of the god Horus, and instead of the messaging app LINE, they use NILE. some of the puns are more subtle, such as how Mizuki Okiura's family name is based vaguely on how a Japanese person would say "ocular." it goes deep.