Catherine is a very obscure game and very enjoyable. This one makes the list for its underlying motivations rather than mechanics or level design. Although this (again) is a very creative character design, the meaning and symbolism of the undead child is more impressive. The following quote is taken right from Catherine Wiki.
The baby itself represents Vincent's fear of having a child, which is raised when Katherine tells him the day before that she might be pregnant. The undead appearance is a design choice to make the The Child appear more menacing and creepy: to Vincent, this Child exists to destroy his freedom and life, chaining him to something he isn't ready for yet.