After playing the 0.3.1 build, I got a few ideas for future content.
First idea would be a custom arena that players can control the spawns for via switches to spawn a certain number of enemies for custom battles.
Second idea would be a new way to integrate the gallery into the main game. Basically you would enter Arma's home and descend into the basement where Gerbera has here private s*x dungeon to have access to all the enemies Arma has defeated.
Third idea would be a Game Over graphic. In it, Arma would simply be in a full body cast with Gerbera toying with her.
That's all I can think of right now. This game has plenty of potential and I think it will do great.