Well.. it's more complicated than that.... I've done some digging myself since nobody bothers to
First, Gurogameguy/Guromangasan is Chinese, based on the game reviews they said the JP translation was shit & also his Ci-En posts are also too short & simple, usually indication of non-JP author
So I explored around Baidu (searching his name & games) and ended up in a certain Baidu Tieba's Bar "Star & Moon" (subreddit? board?). It's apparently a very innocently looking front for another semi-secret circle/community (kinda like sadpanda I guess), with cryptic posts as guide to access their 'real' website.
Thankfully some idiot leaked the website domain & I managed to access it. It's a WordPress website that requires registration & login to access. Definitely meant to deter randos that don't know better.
Lo & behold, it's an 'interesting' community. not much different from F95/E-Hentai/ULMF/Others, except it has a heavy lean on Guro, Violences, and the likes. I don't think I saw any vanilla stuffs there.
Most of the posts are sharing Japanese stuffs, but there's also homemade Chinese stuff, with Guromangasan being an active uploader. posting his stuffs, so yeah he clearly frequents that website.
Posts about this game on the otherhand, were posted by another user "嘻呀哈",
saying it's a work with some friends from the community
There's 4 devblogs, from 0.1 to 0.4
- 0.4 seems to be the most similiar to the end product, or perhaps they just released 0.4 as 1.0
- 0.3 has male protagonist, naturally received backlashes, got shelved, and turned into one of the bosses
- 0.1 has different MC sprite compared to current version
There's no news after 0.4 and the game just popup on DLSite under Gurogameguy name
So in conclusion :
Gurogameguy/san is involved but not that much & he let his friends use his DLsite account (since he's already pretty established there I guess) hence why he doesn't mentioned it at all on his Pixiv & Ci-En
Unfortunately there's no further info on the artist who draw the asset, it could be "嘻呀哈", or perhaps others. I just gotta pray they develop new stuff & gone more public
Here's the older versions I managed to nab from their website, if you're interested :
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Cheers, that took quite some time