This mod is superb! Nice to see the remaster version being TASable after all.
The optimization looks pretty good, and while watching this run alongside the current WR run of "Sonic & Tails" category, I noticed a timesaver in the middle of Marble Zone 2 around 3:26 of the encode video - around 4:16 of the WR run, it's actually possible to jump on the first spiked chandelier without waiting at all by getting hit slightly to the left to allow Sonic falling down earlier than intended:
https://www.youtube.com/watch?v=PpZM3-qs8EQ
Also, the Labyrinth Zone 1 made me realize something between 9:13 to 9:29 (Sonic alone category WR):
https://www.youtube.com/watch?v=Ic1CgqIw3ns
I'm not actually sure, but the Water Shield seems to save a little time at the time you get the shortcut despite the fact you need some backtracking at the beginning.
Meanwhile, nice job and Yes vote.