Oh god, here we go again. Hey, I know you said this was an idea you had before BtS, and yeah, I can believe that, it does happen....
...But from that Title Screen, like Dan said, makes this looks EXTREMELY similar to BtS. Like my old fangame, Sonic From the Beginning... (Notice the similarities in the title screen? It was one of the first things done).
I'm not against the idea of another Sonic 1/2 interquel (?), in fact, I welcome it as long as you do something different that Lake did. Gives us your own unique take on what you think happened.
Be warned though, the fact that this is a Sonic 1/2 interquel WILL bring a lot of negativity to your game, and you're probably not going to be able to escape it unless you do something unlike anything Lake has done before.
I look forward to your own unique take.