Your teacher was 'compensating' the feature set and creativity against the lack of documentation, a trade off. The point that was made above was that in the UK

Your teacher was 'compensating' the feature set and creativity against the lack of documentation, a trade off. The point that was made above was that in the UK we as teachers don't have that leeway. We have to grade according to criteria for different aspects of the assignment. I would have made you put a proposal form in first explaining your feature set, and why you needed those features or what they added to your project. If we had to, that proposal would become the documentation!