I know computer programming the game HUD. Espen had already programmed that invisibility, so when pressing the button E on your keyboard you get invisible. Now you have to wait till the game HUD bar has loaded, to be able to press the button E. you will also be visible some second, changing the time for being a visible and visible is easy done by going into the game HUD inside Unity. I think this was way too make the HUD work. Easy to understand for the people playing the game, and easy to change the time for the people who make the game.
I need to program the key, I would like to keep to work like I house key. You need to find the key to be able to open the door, I also would like to light on the key on the game HUD to light up when you collect the key. I think this is a good way for players to see that they have the key they need to open the door.