Not exactly it, but is planed (in Rebuilding (Latest)) devlog):
"New Plans(15/03/22):-
Annie's Expedition:-
Gameplay :- Collect egg samples/object and return to surface to complete a level. She is weak so she uses jetpack to reach higher ground. But this jetpack has limited fuel that recharge overtime.
Three levels playable as Annie.
Some exclusive animations to this game mode:- Zombie, Skeleton, Bat, Goblins and Ground Mole."
Also not sure is ground mole is planed enemy or was canceled.