1 X-Men reference
1 1/3 Dollhouse references
2 5/6 Buffy references
3 1/3 Firefly references
4 1/2 Dr.Horrible references
(Showrunner is scored as 1/3 of a reference for Buffy, Firefly, and Dollhouse)
(Sing-Along is scored as 1/2 of a reference for Buffy and Dr. Horrible)
The only thing he’s missing is a special power that makes you sacrifice your favorite character 5 turns into the game.
Also, Mutant Enemy is actually a reference to the production company, but I’m counting it as a full X-Men reference because this is a superhero game and Whedon did do some work on Astonishing X-Men.