We already thought of, escape cake, survivor pudding, costumes just need some ideas
Bloodpoint cookies! Image is from Reddit :P
You could also make perk themed balloons or something :v
Edit: Here's some more ideas :)
I'll add a bit more if you're feeling adventurous with this.
You can also try some more idea below:
That's about all I can think of I suppose, its too ambitious to make hooks and other such large objects like LITERAL GENERATORS lmao, but this should also help... I think.
@Killthelinkrabbit made a fantastic Pustula Flower cake for the Halloween Crafting Contest, you could get some inspiration from there.
And @CrazyWraith also made a Demogorgon sweet jar, you could do something similar to spice up the snack table. (I can't attach the picture for some reason but here's the link: https://forum.deadbydaylight.com/en/discussion/96841/demogorgon-sweet-jar-for-halloween#latest)
The cake could be like the one above, or it could be an escape cake as you mentioned, or a "Gruesome Gateau".
Some other ideas I had:
Decorate the party with Bloody Party Streamers (just spatter some streamers with fake blood).
Have "Vigo's Jar of Salty Lips" as a snack, or a party favour (you could fill a small jar with "sugar lips" or something similar, like the ones below).
The invitations could be mori-shaped, or come in sealed/bound envelopes (like the survivor offerings).
You could do a lot of things in general with offerings and add-ons, just look through the list and see what ideas come to mind 😊
I'll come back and edit this if I think of more possibilities.