Mania Mode is great but Encore Mode is totally about dalliance. Because;

-Re-palette of Mania Mode's levels. Although there are minor level design changes, there is not much difference and frankly they made it even more trash.

-Unnecessary difficult special stages. Also, Special Stage 7 in Encore Mode, almost impossible to get 7th Chaos Emerald because UFO is way too fast.

-Angel Island Zone is extremely short. Also Angel Island Zone Act 2 tilesets found in Sonic Mania's game files. And this is AIZ Act 2's file extension: "Data/Stages/AIZ/Scene2O.bin"

Only great thing about Plus DLC, Mighty and Ray, Casino Bonus Game.

Mighty: He has stomp feature. Also, Mighty's sprite sheet, looks like it was built on Sonic but still looks great.
Already in Knuckles Chaotix game Mighty was made on Sonic.

Ray: He has flying feature like Super Mario World's Cape mechanic. And to be honest, Ray's sprite sheet isn't that good. But also more useful than Mighty.

meh.