Spelunky 2 - Mothership & Shopkeeper lore
Lahamu (Alien queen) is the eldest daughter of Tiamat. A jealous and vindictive warlord with powerful psychic abilities.
During the first wars, Lahamu stole the Original Man to create clones of him with varying degrees of success.
The Aliens are Tiamat's firstborn. They harbor a deep jealousy of the Olmites, whom they think she favors. That's why the Aliens and Olmites are at war in Neo Babylon.
The Olmites are Tiamat's secondborn. An inquisitive race that excels at creation.
There's also mention of the second war (ongoing) in the Mech rider's journal entry.
"A MOYA-class mechanized armor designed by Aliens to combat the Olmites during the second wars".