Aw yeah, Sonic CD. I own the original US Mega CD Release, the PC port via Sonic Gems Collection on the Gamecube, The Retro Engine remake on Android and PC and recently via Sonic Origins. It's funny. I played this game way after i got introduced to the series via Sonic 3 & Knuckles as a kid. And even then i always disliked the more exploratory level design this took from the first game.
But. I cannot ignore how much it's very strong Art Direction and how it has influenced my tastes growing up. Even if i only came to discover the original soundtrack on the web years after playing it via Gems Collection, The general look of the games environments, it's themes of time travel, ranging from Eggman's Detartrated and unkept dystopian future to Sonic's vibrant and optimistic merge of Technology and Nature are ones i often think about when i conduct any fan works related to the blue hedgehog.
I love Sonic CD. I catch myself listening to the remix album that was made during the time of the original release, take a listen to this!