Now THIS is more like it! Chemical Plant is one of the single best zones of any sonic game; they absolutely nail the pure speed and adrenaline that comes with it. The other stages are a little bit hit or miss but overall I enjoy them all for playing very differently to each other.
My only criticism would be that boss fights, particularly the final zone, are not particularly enjoyable. Sonic has struggled with these as early as his first appearance and while I like that some of these have very quick ways to beat them, none are particularly interesting. The final egg robot is a pain in the ass as every time you die you have to fight mecha sonic AGAIN! And I died a lot because of his tiny hit box.
Other than that, they nailed the blue blur on their 2nd attempt. Good job.