I don't like Sonic CD, so you can probably guess how much i liked this, but it really is solid and there are some cool ideas in there.
The level design reminded me too much of Sonic CD in terms or random shit everywhere, and levels are more maze like than those from 3&K and Mania, which i guess makes sense given that the original Megamix was a mod for Sonic 1. I finally played all the available stages with Shadow, and he is crazy fast with his drop kick, which is literally an instant drop dash.