(note the first concept art image in the concept statement didn't work, but the rest were great)
A fantastic concept document which for the most part hits all the aspects that we were looking for to the right level of detail, with great referencing and figures.
The only improvement that could be made is to be more specific about the gameplay mechanics and how they operate. A bunch are listed, but only at a surface level, so it is difficult to know exactly how things will work (e.g. the friendship system with villagers etc). On the topic of villagers, the main scope issue I see here might be in implementing what looks like a large number of different NPCs, seemingly with dialog (again another large feature). I would encourage you to follow the game modelling process from the lectures to see if you can determine the feasibility of some of the features you have in mind, and prioritise them by (a) what is key to ensuring your game is fun and (b) what is valued most on the Assignment 3C rubric.