Hot diggity dog this is good.
I really like the references to the Sonic 1 Prototype, The music is really good, and the extra bossfight genuinely suprised me in the best way possible. The only bug I have to report is that the Act Card for Granite Zone 2 reads "Sunrise Gate Zone 2" instead. But overall, this shows a lot of promise.
Keep me posted, guys. I want to see what happens next.