HI. If you can please specify what is the issue, maybe I can help. When you open the game, you should press "space" button, it says so in the game. After that, you go to the main scene and it says "E" key for interaction, did you maybe miss that? If you go to the object, it is highlighted with a cube and a circle, then you click E and it should work. At any stage, is there an issue?
Looking forward to your response.