Yep, "Creature Get!" co-developed by Lain and Nitely(who did 2 other games, but one failed at the first release due to new patreon rules about "underage looking/being characters", and the other game failed in the making, last news about Nitely is dated 1rst november 2023)
The collab I'm referring to is Lain and the AI CG artist ShiroV8
The game hinted at is on her SS
It wouldn't be allowed here
She uploaded it to another site
Someone on that site reported the game to the host as csam
AI CG Loli content that looks too realistic
the host forced the site to remove the game
This event was a shock to Lain
less than 2 weeks later she went ghost
ShiroV8 being the last to hear from her