@ImmortalA1000 yes, I agree: the devs master their engine and can create more games like that with different graphics & sounds by copying & tweaking their source code. But changing sound and graphics (and levels) doesn't make a new game.
If you want to create a top down racer from Supercars 2 sources (which I have) it may be possible
Well, ATM I'd just like new tracks for this game and noone has provided me some, let alone a whole new set of graphics
Side note: a lot of Lotus 1 code is reused on Supercars 2. So devs already do what you say.