This little house is amazing! So cute and you obviously put a ton of work into it. I've heard the tiny styrofoam balls are not good for hamsters, though. You might want to look into that.
It is AMAZING how you made it but please try not to use hot glue as it can be eaten by the hamster or mouse and it is not digestible. Use elmers glue as it is water based but hot glue on the other hand is plastic based. :))