In the Starter house we added a light that turns on and off when you click it. We also added doors you can interact with to open them. We also added a secret room you can explore to find another secret room.
You can see it in this video here.
I came up with an idea. So, in order to complete the level, you have to find a relic and restore the peace in the memory. I decided that do add an extra detail we would make a fake relic that would send you to a room and you would have to escape to continue. The red is the fake one.