What a creative take on the theme! Loved the monster under the bed idea, and it has a fun lighthearted tone to it, making it lovable. I would recommend working on the collision if you keep up with the project (which you should, cause it has huge potential) to ensure the objects don't go flying through the walls. It's also really easy to send the teddy bear through a wall/in the air. Maybe you could adjust the weight of the objects to make them feel like they have more substance and identity? One question I have is: Is there a lose condition? When the parent reached the door, nothing happened. I assume that's just placeholder for future functionality of a lose condition?
Overall, great job. I loved the idea/theme and hope you keep up with it!