This guide will provide some basic strategies to aid in beating the game.
Basic Strategies Guide
Item Stacking
This is one of the most important concepts, especially when engaging in nightmare mode. Items appear scattered all throughout the map and it is in your best interest to gather each of the items into a particular area. Gather a good amount of fuels and drop them near the goat altar. Gather the hay and place it outside in an area of your choice. Med-kits can also be gathered in an area of your choice...my personal favorite area is stacking all the med-kids inside the house in the "TV Room". I don't think it's really called that, but it's the room with the television that has a blue screen and makes a slight noise. I often hide here during her rage fits and have never had her run into the room with the door closed!
Please note that it's best to stack items before you have any goat sacrificed. Otherwise she will be running around too crazily.
Ana
Early GameStun her with the UV if she is running at you...this is not necessary though, as sprinting will keep you out of her reach. To refrain from losing all stamina, I usually take my finger off the shift key for a half second before pressing it again to continue my running. I have managed to stay out of her reach for very long periods of time. If I feel she is too close I run in the TV Room and close the door.
Mid-gameEssentially the same as before, but I get paranoid faster and only run about ONE LAP around the house before hiding in the TV Room.
Side note: The TV room can be found entering through the back porch door behind the house, I believe it is the first door to the right from there.
Late-gameThis ♥♥♥ runs fast. She will probably catch you if you try to kite (she almost certainly will catch you) so it's best to be hide from room to room. Having friends to play with *cough* sacrifice is good here, as it gives you some time to hunt down goats as they get dragged away. Just keep an eye on how many med-kits you have left!
General Tips
Multi-sacrificeAt the beginning of the game this may be useful, but it has a stronger impact if used mid-game. When you have a party of four people, ensure that two or three of them grab goats and sacrifice them all at the same time. This way you technically spend less time in that specific rage state...going from 6/10 goats rage state immediately to 9/10 goats instead of doing them all separately. This increases chances for survival.
Floor DemonsWith the multi-sacrifice tip I just provided, spawns a small issue. Each time you burn a goat it spawns demons, thus burning threee goats in a run spawns quite a few. Just be careful and go through and burn them all before grabbing more goats (: otherwise they'll grab you and kill your ass, especially if you're trying to run away!
W.I.P.
Source: https://gameplay.tips/guides/9662-devour.html