Aw yeah, this is happening!
This is indeed Emerald Coast from Sonic Adventure (1998) in Sonic Robo Blast 2 (Also 1998). The attention to detail in porting the level, and the creative liberties to make it work in SRB2 show that a lot of love and care was put into this.
There are a few issues I found:
There are a lot of broken and uneven slopes, which could be fixed up with a quick polishing pass.
The wall running script works very poorly with the flow of the level. It's a bit too jank and I just ended up jumping off the floor slopes instead in places where I could.
LWATER is a horrible texture and seeing it loop into the horizon is particularly agonizing. I would recommend, for a similar color but a better texture, using DSSBFLR4, and putting it into the skybox instead of a horizon effect within the level itself. This will ensure that the texture loops less often, which will alleviate a lot of crust.
Great job, and Welcome to Releases!