dafuq are you talking about?
Do you know that this game is a Remake of Mushi no Kangoku , with Art made by Viscaria /Atella? Both the game and his Art were around for ages, way longer than any AI Art.
There is no "Story" yet. The original game had no story outside of "Girl travels to an Island to look for scientists". The Remake has not improved on this, but Eroism said the Story will be worked on at some point. Not surprising since there isnt any story to begin with.
Farming Crystal gear is the only "Endgame" activity, currently. There is no Ending or Epic Boss battle yet, so farming Crystals is the only meaningful gameplay outside of watching a girl get molested by Insects. My grinding goal is getting as many Parasites as possible.
If you really want to skip the grind, you could save before visiting the shop and save scum until you get Crystals.
Since all the original CGs are implemented already and Atella didnt approve some of his other art to be used in this game, development slowed down significantly. His way of doing CGs involves lots of pictures to be made for one scene, so it takes time to mimic his style.