Thanks for playing and for the nice compliments :)
There are a few changes to the camera in the main game. The idea is that placing the camera down gives you a curated view of what you need to be looking at - but I can see if I can make it more intuitive!
As for controls, there should be tutorials that pop up at certain times (starting the game, picking up the camera for the first time, hovering over an item for the first time and opening inventory) - they are also available in the options menu. Potentially though you had a bugged build that didn't show these tutorials - woops!