Oh, I thought it was going to be SA1-style, like - you choose your character and play that character's story. Either way, I say go for it!
TSDude and I will be doing that for our SA2 TC mod (which btw doesn't have much progress).
One funny thing I noticed about the Walls of the Void and Sonic Boom, is that they have quite alot in common from what I've seen from the behind the scenes video. Here are somethings I've noticed are similar to the walls of the void from that video:
1.) Character personalities - The creators of Sonic Boom said they want Sonic to have a bit more of an adventerous personality, always ready for an adventure, and still have that brotherly connection with Tails, but Tails will not be afraid to tell Sonic if he is wrong on something, like in an argument or something. This is similar to the walls of the void, because as Sonic and Tails (DAMN, got that song stuck in my head now...) are traveling through the cracks, Sonic is simply having the time of his life, wondering where the cracks will take him next, while paying little attention to what they are. Tails on the other hand is trying to figure what they are, and how they came about. Tails later in the game gets into an argument with Sonic if the player had decided to go to the Sonic Spinball levels instead of going to the Star Wars levels, because of [insert long storyline explaination here].
2.) Different Characters and their abilities - Sonic Boom has 5 main characters from what we have seen, Sonic, Eggman, Tails, Knuckles, and Amy. Each of those characters have their own abilities, and this is ESPECIALLY so in the walls of the void. In the walls of the void, there are 6 main characters, and 5 playable characters. Each character will have their own unique gameplay (not really so for Shinx). A good example is Goku, and his ability to fire ki blasts and (hopefully, I'm not fully there yet) charge ki to allow more ki blasts to be made.
3.) Dimensions - Sonic Boom is a completly different dimension, it takes place in a completly different part of space and time in terms of the original sonic timeline. The Walls of the Void will follow the storyline of the original sonic timeline, however it will be explained that the original timeline has created a temporal loop of timelines, making two timelines in one dimension. There is the prime timeline, which is the timeline we know as, and the new timeline, which includes these games in sonic's timeline in order; "Sonic 1, (Tails' Adventure), Sonic 2, Sonic 3/Sonic 3&K, Sonic Generations, Sonic Robo Blast, Sonic Robo Blast 2" and following the list, the Walls of the Void. It will be explained how the timelines split into two in-game.
