Sonic 2 is how to do a good sequel. It introduced so many fun features and the spindash oh my god the spindash. I love it.
The level design is way less platforming based and has WAY more speedy sections than Sonic 1 could ever think about doing.

Sonic 3 is a way better game and has less bullshit overall. Yet i can't help but like Sonic 2 a lot more.