This looks just like in genesis but scarrier and in srb2 style.
If you're referring to the texture to the left of your screenshot, those lines are cracks in dirt.
This doesn't has to do with Sonic, but I had just finished some more anims and wanted to work on something else real quick:
Haarrarrahhhaharharharhah hah
Maybe, just maybe I'll make the rest of the textures look consistent with this monstrosity I made once I find out what some textures are even supposed to be, such as that weird wall texture full of lines.
I always assumed they were bricks.
Bricks are unlikely not so much because they don't make sense (SMB3 had floors made of wood)
Still images don't do the dust effect justice imo. http://gfycat.com/NextMinorKakarikis
That said, I wasn't expecting Roach to bump the particle spawn rate up so high and it's actually kind of extraordinarily lag-prone. That can be dealt with, though. Probably changing it to fewer more opaque particles for a start.
Well, since you asked so nicely...~
So, will other remade vanilla characters like Chuckles and Iceman Tails be updated to have spindash and drowning animations? I'm also still curious about those awesome spring sprites.