Sonic's animation file was made from the ground up rather than straight up ported. This means that every animation works now as it should. Any S2 styled edit is by me.
New title screen built from assets from Sonic 2 and CD.
New sprites for various objects. The shield sprite is from Sonic 2 as an example.
Tails got his old spring bounce animation back but has no changes outside of that.
HUD taken from Sonic 2 and with some slight tweaks by me to have them work properly.
Sonic 2? In my CD? Sounds about right actually.