In my opinion, there are two points of view. First, game self, where player shall finish some tasks and progress in the game. Second, excelent giantess crushing simulation. I would have some idea, which would be for sure very interesting for those, who like this second point of view. Implement some free mode, where player can only watch girl walking and crushing. For this, wall labyrint shall be erased and maybe only periphery walls can stay. Possibility to pause the girl. Player can also fly vertically, I like to see the girl not only from ground view, but also from some height, over roofs of other houses. Possibility to command the girl, some very simple commands, like as "turn xx degrees" and "walk xx meters".
And of course general ideas, more outfits (swimsiut, gym suit etc...), more moving styles (not only stomping, but also normal walk, slow walk etc...), more models and more objects to be crushed. I know, it is not simple, but let this amazing game to progress forward.