Sonic Frontiers - Cyberspace Levels With Sonic Adventure 2 Music
A few Cyberspace stages with level layouts and music from Sonic Adventure 2 stages: Metal Harbor, Green Forest, and Radical Highway.
I'm also using a mod that alters Sonic's momentum: https://gamebanana.com/mods/411485
So, if it looks like he's running faster than normal, and flying, it's because of that.