SPOILERS:
Hey silly cat what's up? Lilly did not kill Enzo, they both returned to the surface world above. Mothlight 2 may or may not happen, Idk, I will be making another game soon which has no relation to Mothlight other than it's on another planet in the same universe. All of my games and projects will be set in the same world! Soulscape too ;) Enzo and Lilly's story will most likely continue in a content update or Comic, but their time is not over and the Old Ones are still a huge threat. Expect more from them.