My main input into the game was creating everything related to the enemies and their interactions.
I designed how the crawlers would wander the level, or rather how they'd patrol their territory.
I created their hearing system, including creating ways for the other programmer to mask sound when the player hides.
Add to this that I also had to make sure the crawlers couldn't hear the player if they're in a vent.
I also created the spotting system on the lighthouse, this includes following the player when they do spot them and calling all nearby crawlers to that location.
Next I created the bottle throwing mechanics, to distract crawlers. I also created the code functionality, randomizing them every new playthrough.
Last but not least I had a large part in designing the level layout, the final prototype was fully designed by me and the one used in the project is heavily inspired by it.