Great game and concept! I liked the different reactions the teacher had. A few things:
1. It was a bit hard at first to figure out what could be picked up. Maybe add a hover state to them?
2. It wasn't always the easiest to drag the items into the inventory slots because it wouldn't always register.
3. This may or may not have been a bug, but if I made something that I had already made, it would take that thing out of my inventory and put it on the table.
Otherwise, great job!