Really like what you have going on so far. I think a lot of variety would be great in this game. The random sex you find here an there with the zombies and npcs is a nice touch, alot more can only be a bonus. It would be nice if their was a zombie on zombie system too. Maybe like an item you could throw that releases a gas that cause the zombies to go into an orgy mode so you can distract or watch them with each other. Also maybe you can obtain a strain of the virus for the main character that once taken can enable a option so that the character can have different interactions with the zombies and such and maybe add futa for main character kinda like how the female zombies have their organ. Maybe the character gives in to the virus urges and you have H acts with survivors. Just some ideas. Keep up the good work.