It has every character from all 3 games: Axel, Blaze, Adam, Zen, Skate and Max plus 2 secret characters.
43 multi path levels.
Over 50 enemy types.
Over 30 new remixes based on the original Mega-Drive/Genesis music.
Also:
*2nd Player CPU option with 5 levels of intelligence, (hehehe, you can still have that 2 player feel without super-gluing a game pad to your best mate's hand)
*Profile editor (nothing special, just remembers your name, age, country, favourite character, favourite difficulty setting, palette setting, colour of your jocks etc)
*Palette editor (completely changes the look of your favourite fighter from the colour of their shoes to the colour of their hair)
*Movie theatre (cutscenes he made for the Remake I guess. I dont remember any movies in the original Mega-Drive versions apart from the intro city shots.)
*Image gallery (I wonder if he'll have fan art from his site in this section. There are some f**king amazing artists on that site. Probably just box art though.)
*New weapons such as pistols and rocket launchers. YAY!
*New stand-alone game modes like capture the flag and volleyball. I know; "What the-???"
http://www.bombergames.net/sorr.htm I dunno what else to say. It have Adam, new enemies, new paths, unlockables... it just real dam bad. Download have fun all you old school gamers. Is 71.9mb though, but don't worry dial-up people, it worth it!
*mod edit: minor language change, nothing majour*