Hi!
The game itself is in very early stages of development, I'm still testing several gameplay possibilities, the most fun to play and the most feasible for me to implement in my humble engine without taking too long.
That said, What is decided for sure is that the game is a 3D open world RPG sandbox-like with surrealistic backstory. Most likely will be 3rd person (I still swing between 1st and 3rd, not yet decided).
There is a big selling point I'm trying to implement in the game, but it's not yet complete and I'm not sure how much of it will be computationally possible, specially for a solo developer to implement by himself, that's why I'd rather not reveal it until I'm sure I will be able to deliver it, that's the X factor I described in the first post.
Hopefully I gave you a minimally accepted answer, as for now I have more questions than answer myself, I'm sorry about that, but I expect to come up with more detailed info in the upcoming months.
Thanks man, I appreciate the interest.