Came across your post on reddit and wanted to try the game. Great mechanic and solid puzzle design on your intro levels. I agree with some of the posts over there that a story is needed as a driving force to the game but this is a fantastic vertical slice!
Couple low lift things you could do to help telegraph stuff to players would be some indication of intractable objects. The click plays any time E is pressed regardless of if something is interacted with or not which could be confusing. A slight glow effect or making the hand buttons light up by proximity would certainly help draw attention as well.
Additionally rendering a texture of the picture taken to the camera's screen would be a really nice touch. I made a little mock up for you. Not sure how to go about this in Unreal but it was pretty straight forward in Godot when I was doing something similar in my game.
Cheers and keep up the great work!