Nice variety of gameplay elements and I like the possession mechanic which turned out to be quite grim! Neat 3D models too!
I guess one comment would be that its not very clear what objects the ghost can jump on, as I was trying to jump on the porta-toilets. Was briefly stuck in the top left corner of that construction stage as well. Its probably quite challenging to make this a 3D platformer as you'd have to consider all the camera-related issues. The sandbox-like nature of the game does mean that you could think of ways of allowing elements to interact to cause chaotic behavior. E.g having something set on fire by the bbq pit running by a bush which is connected to an oil leak from a car, causing an explosion. That's probably also kind of challenging to implement, but still an idea for consideration!