The controls are terrible. Once you start running, there's a lag that kicks in with the jump that makes it really hard to time jumps when you are near an edge and the floaty nature of Sonic makes it absolutely tedious to try and control him in 2D mode. Also something to note, on most platforms, they're too high for even the double jump. At the second jump, you have to hold down the jump button in order to even reach those platforms as this adds an extra height to the jump and if this isn't right, you won't even come close.
Also, the remix music sounds bad IMO compared to the original. Wish I had known this was going to be the case or else I would have changed it to the original in the beginning.
The yellow bouncing platform that follows you around has tendency to go slow so that you have to keep trying move yourself around just not end falling to your death and they do this thing in certain boards where you can follow all only to end having to find you can't go that way and double back a large distance.
Playing the Switch version and I am noticing this lag that kicks everytime it loads a new board and it can take awhile.