Alright, I have to say that I accidentally read "gunstar heroes" before clicking on the link. Luckily guardian heroes is also from treasure which makes it above average by default.
I never bought a sega saturn, but if I ever bought one, it would be for Nights into Dreams, some dragon game which is supposedly good and guardian heroes.
Apparently it is really good and to be honest I think I even succefully loaded it into an emulator, but unfortunately I didn't continue playing it because my attention span is so short, this post here would be too long for me to read it.
I finish with the question: Is anything changed for games on the XBLA, including this one?