For the first few seconds I thought it was dull and simple, but it turns out it was just a well done tutorial. After that I was hooked. Great job!
One small nit would be to make the moment when the item is "consumed" be a bit more obvious with some visual. As it is, it can be easy to think an item you know you sent into the hearth has already been counted and leave an item on the belt that shouldn't need to be there.
This could easily be a successful mobile game.