Thought id try to explain how i think the projection works so you too can see how cool the game is (and for anyone else struggeling):
I first use the astral form to scout the area and find the 'button' (square dot somewhere on the map) which you need to collide with in astral form to get rid of the blue bars that block the human form from getting to the big red door aka the exit. In the astral form there are walls that the human form doesnt see/ interact with but that block the astral from getting to the button. You need to position your human so that when you project the astral (which always emits from your human) can get to the button without being blocked by the wall.
I hope that makes sense :D