You can also play it here:
https://turbowarp.org/621300370
Controls
Z to jump
arrows to move
down and z to spindash
space to start (DUH)
c to play cutscene 1
2 to play cutscene 2
I still need to add act 2 to lava reef zone.
-------------Bugs---------------
Random spawn point: Do not click the story select too early or you will not see all of emerald town act 1.
Annoying Music: Don't sit too long, or else all of the songs will overlap and hurt your brain. this will be fixed in later updates.
Crappy Tails Physics: Tails cannot fly because the Tails I have that can fly, will flip over for some reason.
More Weird Floor Clipping: Be careful with the boost or else you will fall to your death.
Tails' Jumping Clone Revealed: If you manage to pull this glitch off... CONGRATS!!!
Characters Not Loading: If you skip to the final zone, none of the characters (except Sonic) will not load.
These are the glitches I found testing it. Let me know if you found any others.
(Note, this is the first demo, it only has 3 of the 9 zones, and 0 of the 4 bosses).