Hell, I practically grew up on this fangame. I can trace my introduction to the Sonic community at large back to two events: one was finding Simon Wai's Sonic 2 beta page and the other was SRB2. Sonic Adventure was still relatively new on the scene and it straight up blew my mind that I could play a 3D Sonic game on my janky old Packard Bell PC. Besides switching up the engine entirely, which I think might be the devs' favorite running gag by this point, I'm also hard pressed to think what else could shake up the core of the game as much as slopes or polyobjects. The run through 2.1 was already pretty awesome, 2.2 looks like it'll be something real special. These guys have got a serious vision for SRB2, it's just on the back burner for much of the time between releases.