The game currently costs £4.99 which includes the kitchen, lounge and study with more to come. As for that last puzzle in the basement, the shapes relate to numbers. I couldn't quite fathom it out, but the best explanation I could think of is
across the middle line starting from the left outside ring-you have the two inverted 't' shapes, then two circles, after the centre it's two of the inverted triangles and one circle
you may need to play around with the combinations. Hope this works for you.

Just played again and it does work with this combination. The
two strips of wood do help-a bit!)