Despite the small glitches, this game is great.
The game is great for a flash. Though there are still some bugs that cause the character to bounce off walls(this is very annoying when you are trying to jump to a higher ledge that is over spikes). Another small downside is the fact that none flight characters don't have their action(like Sonic's blue wind attack). Despite this, it was awesome to be able to change the in game music. It was also awesome to be able to play as Shadow(though he doesn't have a special air attack). I also found out that the cool spinning egg boss was taken from Sonic the Hedgehog and then modified for running battles. If you ever make an Ultimate Flash Sonic 2, please try to fix the bugs and include more special moves(for example: Knuckles' gliding skill).