I am a big fan of the game. When I was about 12 years old I use to stay up at night and imagine capturing TV and comic book heroines with my shrink ray and keeping them cells to train them. This was decades before trainer games existed. I know they have plans of their own to complete the game, but here are my suggestions for the future, and maybe beyond.
More villains: Clayface, Silver Banshee, Grundy, Ace, White Martian, AMAZO, Scarecrow, Killer Croc, The Brain Monsieur Malleh, and Madame Rouge.
Henchwomen: Star Sapphire, Lifewire, Volcana, Ravager, and Jinx.
Girls: Wonder Girl, Jessica Cruz GL, Bumblebee, Jinx, and any girl from the Legion of Superheroes.
Women: Batwoman, Dona Troy, Mera, Fire, and Ice.
Magic Room Occupants: Circy, Zatana, Le Fay, Jinx, and Silver Banshee.
Leash Locations: Legion Hideout with male villains looking on. Lex's office with henchwomen looking on. Adding sex acts to increase the humiliation at locations. Urination in public, though this may be a turnoff for some.
With the robotics in the lab: Make Metallo sexually functional. Sex machines.
Costumes: Not a big fan of the slut costumes. But would like to see more slave, haram, bondage, and underwear. I really liked how there were two stages of stripping for Mercy. It would be nice if the street close costumes could be set up with longer stripping with clothes and underwear.
Fetishes: This is a very fragmented subject. What I like may not be what you want to see. There are a lot of fetishes that turn me off as well. The ones I am going to encourage additions to the humiliation factor of the game. I would like to see tentacles, bestiality, sex machines, monster sex, tickling, and urination.
Add Location: To the Tala's Workshop a tentacle pit. To the Living Quarters showers, toilets, and discipline room. The discipline room would have sex machines, tickling, and spanking. When someone ignores Lex on his visit to them, they could be sent to the discipline room. The tentacle pit could be used the same way for the magic users that ignore Lex.
Just some suggestions that came to me. db