Limbo doesn't seem to work like "regular hell", so I highly doubt any angelic or biblical demonic themes.
It's obviously an evil reflection of humanity, so while there might be some subtle references (like the angel wings on the flying enemies, or their Cupid-like form in general), the general tone probably will be that of sin: humanities wrongdoings incarnate. I can see the name "Gluttony" pinned on that maggot-thingy, and the fat ugly boss in the chapel seems like "Wrath" to me.
Just some ideas.