There is a

Main Easter Egg Quest
All 4 Radio Locations
Buildable power
Buildable Sheild
Jumpscare
Easter Egg Song
Ritual Table Easter Egg
Next Map Teaser
x14 hidden Refrences

Congrats APPLEKILLER & Th4nk5UglyG0d for working out and posting the EE

Music Easter Egg

There are 3 Gramophones hidden around the map
1.In the kitchen at spawn
2.On the desk in the first room upstairs
3. On a cabinet in the basement

Main Easter Egg (there are 4 radios around the map with hints)

1. There are 5 teddy bears arond the map, one in each room that souls will need to be collected
2. to acces the last teddy you need to open PAP by shooting the buttons of three switches around the map (One in the kitchen, one in the spare room upstairs and the last one in the basement)
3. Once all the souls have been collected a door will open with a portal that'll take the user to the buyable ending for 60000 ponits

Jumpscare

looking outside the map through the window in spawn next to the crafting bench (the view with the bus) at the house oppsite there is the shadow man in the fog, shooting him activtes the jumpscare.