Honestly, Modern Sonic in itself is stellar when it comes to customisation, abilities and overall creativity of the character itself, but I myself thought that it could have had more to it like a Spindash, used by crouching and jumping, UI based on the Adventure titles, Advance games or even DS Colours and even the option to disable certain abilities like Rush Mode or Light Speed Dash via commands. At the end of the day, it's still a beautiful character to play as.