I think I just finished going through every option in the game and I have to say that this was extremely well done. The characters are built up well and have their own unique characteristics which only makes it feel more personal and immersive. The other highlight would have to be the sheer amount of options you can choose from to interact with each giantess (obviously it's mostly foot stuff but that's because I'm pretty sure that's just the target audience he was aiming for. However there are some other kinks sprinkled throughout).
I HIGHLY reccomend you try to get the attention of Allison and Alena first because those are some of the most developed paths and most exciting once you get their attention, in my opinion. Make sure to explore as much as you can during these to find some amazing interactions.