Admittedly, I've never been much of a 2D Sonic person. However, this is one of the one's I used to play as a wee child. It's very playable and there's like only a few bits that are super annoying like the last Eggman boss or the Egg Rocket level. I also enjoyed the Chao Garden a lot as a kid.

Also, the Cosmic Angel Zone and the Egg Rocket Zone themes are based AF