I think it's a (good) start to a gamejam career. I can only generally recommend that 3D is not always a good choice.
There is probably no need to address all the shortcomings here, I take the game more as an attempt to see if the authors are able to create a game at all (and that they will try again and better next time), so just the most general advice:
- not everything has to be 3D
- ideally take the objects from one package so that they match each other
- a person is NOT a train or a car, wasd controls would be easier
- keys + lock are nice mechanics, but they don't replace the entire gameplay
- by the beginning, tell the player who is, what is, what is happening (am I looking for something? am I running away from somewhere? somewhere? do I have a task?)