Evolutionary Game concept

Hi,
I am physicien engeneer but beginner in programming.
I am interesting to create a concept of evolutionary game. But i don't know if it's possible (and legal) with UNITY:

The project:

- The purpose of "the game" is that user can customize a scene:
For example, the user start the game and a menu appears:
We offer in this solution the possibility for the user to import contents like:

- Landskapes,
- People,
- Houses,
- Cars...etc.

In this way the user customizes his environment.

The contents are already made to be compatible in a same scene.
Next, the user open the 'game' and can move inside the created scene: he explores the house,
plays with the car etc.

Is it possible to make such "game" with UNITY? If yes, what would be the main difficulties?
Thanks a lot ion advance for your replies and advices. And sorry for my english (i am french)