It makes me quite happy to see this project again after practically 10 years since I saw the post in some forum.
I love the new visual environment, the music, and how it takes prototype elements from before the release of Sonic 1.
Now, I ran into some problems, first is that the music volume is turned up despite having raised it in options. Second, I feel that the invincibility frames are very short compared to the trilogy.
At minute 10:12, which I also attached the video, the toad glitch occurs, which for some reason does not stop playing its attack sound throughout the level and becomes quite uncomfortable.
Keep up the good work Overture Team!