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HH isn't a 3d game, is a ren'py visual novel, creating using a 3d tool with an export to image (or video) function.

This means that, every time you see a girl in a different pose, that is an entirely different image or video (with a weight of several MB), instead of a different set of coordinates on an existing 3d model (with a weight of a few kB at the outside). 

Now, if Runey could use the Illusion engine to make the entire game, it would be MUCH smaller. 

Unfortunately, there are several problems with that idea.

First of all, Illusion does not, as far as I know, license out its engine and assets - and if they did, it would probably be outside of Runey's current development budget. 

Also, Runey isn't (to my knowledge) a C+/-* programmer, so he would have to get an entirely new skillset, which is of course extremely time-consuming. 

Also also, even if he were a C*+-/@?!# programmer already, he would still have to redevelop the game pretty much from scratch - or from a storyboard equivalent, at best. 

Which of course would introduce a whole new host of bugs, and take a very, very long time... Just to get back to where we are right now.

Basically? We either deal with an ever-increasing archive size for photos and videos, or else give up on the game entirely.

I don't know if the current videos are H265, but even if they aren't, which would mean some savings would be possible recompressing the videos... New content is coming, so the size of the archive is going to increase.

In a sense, Runey isn't developing a game as much as writing and directing a movie, and movies take up a lot of space.