This will cover anything and everything in the game.
Me personally i would have gotten rid of the targeting system, allowed sonic to move forward during jumping and got rid of that jump movment. Letting sonic run properly when he moves not seem like hes floating before he goes fast, go back to the old school spin motion and jump flash like sonic 3 had when you hit the jump button twice
By far the most important for me (being retro) is to have an option to turn the game 16bit and have 16bit music version aswell
And im not the first to say this but im shocked at Sega releasing episodes and charging the earth when we all know 6-7 months down the line after their all released their going to do a complete game...... Shame on you Sega!!!!!
Maybe we should get Sega to release a megadrive with every game built in not just a 20-in-1 device..... Whos with me lol

I removed words "die hard" as it looks like its going to cause some form of hastle lol