Yeah, I had checked that out before. I'm not a C3 user yet but it is interesting. That game is more along the lines of Legend of Zelda, though. I'm really talking about something akin to Final Fantasy, Dragon Quest, etc. Those games are far more complex and random and that's what I'm looking into.
the game mechanics don't change, but the graphics, the demonoir offers you the logic and mechanics of a rpg gameplay, you can take those and do ur pseudo 3d with C2 or C3 and make whatever game you want, you have to remember games are like puzzles ... its a bunch of random pieces that are arranged in different ways, yet their goal is the same.
Also if you are thinking Final Fantasy 3D or dragon quest 3D you might find it a bit difficult to do in Construct as its a 2D game engine and not a 3D one.