Also, are there any multiple endings?
Sort of?
The ending splits and then merges based on a choice right at the very end. So the final-final scene is always the same. There are 4 other endings in the script, but I had to take a week off in the middle of the jam, so only the "perfect" ending is actually implemented. (Nikki's presence in the epilogue was going to require finding certain pieces of information when exploring the house.)
I'm hoping - if I still like the story in a year - to put together a "Redux" version which has the other endings, points to investigate inside the house, and the ability to play as Norm as he has his GOOD TIMES in the basement.
(Unlike the other characters, the entity does not pose as one of the other players when messaging Norm, but rather it appears as his mother. Also, spoilers, I guess. Some text messages do not come from their apparent sender.)