Vivid Noise - Sonic CD (2011) 

Time Twisted is probably the fangame your thinking of in the outro. Great video btw! Super underated! I prefer the "gotta go fast stor of gameplay and just getting to the end of the level while trying my best to find big rings and other cool stuff, i appriciate cd, but its just not for me. The idea of using sonics speed and pinball physics to traverse the map finding everything you can and it even introduced my favorite sonic atogonist metal sonic but ive never cared for games where just exploring is the main focus, thats probably why i foule never quite click with hollow knight. Though the main classic trilogy is my fav, i definetely get what your saying.

I absolutely adore CD! I really so think it's underrated due to the very open level structure and pushing back against the "get to the end as fast as possible" that the other classic games are known for (especially in stages like Wacky Workbench, my own personal hell). The time travel mechanic makes amazing use of the soundtrack, utilizing the on-board sound chip for the past music. I've never NOT enjoyed replaying the game, and although the game isn't the BEST classic game, it's my FAVORITE classic game!