This game would look horrendous in DAZ... Like most games.
To be honest, there've been Koikatsu games that have looked better too. It's a function of skill, which itself is a function of time and talent. It's not the worst, so talent's definitely somewhere in the cards. We'll see if the time comes in, given the game hasn't updated for months.
I think, perhaps, the game is a bit wide-scaled. It's a common mistake among new devs, but going as wide as all Vtubers means there's not enough devspace for even a medium burn, much less a slow burn, and that results in stuff like the girls being hyper-eager to screw and vaguely OOC.
I think, when you're designing your next game, you should peel back a bit on the scale. Focus on a single company, or even a generation of Vtubers. Hololive is huge, pretty sure a game focusing entirely on Myth or Council or X would give you a lot more time to focus in and really nail the details down. A wide net only captures shallow fish.
Koikatsu as an animation/scene studio is always going to turn people off, same as I all but religiously avoid DAZ games. You can mitigate it with clever filtering, custom animations, the whole shebang, but the further you can get from the "Everyone's got it" sort of animations, the better probably in terms of audience attraction. The writing and smut will determine the rest.