This Sonic engine attempts to imitate original Mega Drive hardware as close as possible. The MegaDrive Engine contains only 1 test level and I have the source and the created product. More features will come soon as this is a work in progress! https://github.com/XPointZPoint/MD-Engine
Seems like this is a follow along of part 1 of this GM Sonic tutorial from 2015 Interesting decision to post it at such an early stage. As you go though, I'd suggest looking at the Sonic Physics Guide to get Sonic's speed and movement more accurate to that in the classic games. The tutorial kinda just "makes up" the numbers for speeds.