I have an added cutscene idea for transition for between zones. It's in Credits/Notes
Cutscene: Sonic stops running in enough time near the goalpost to notice that everything's getting darker. Sonic lays down and rests. 24 hours later, Sonic wakes up to see that Eggman has covered the sun with what he calls The Egg Moon. Sonic breaks the 4th wall by doing a thumbs up pose/Sonic 3 Victory pose and runs to the right in supersonic speed. End of cutscene