Honestly, everything about its release was poorly timed/thought out.
The week before it released there was Relink, Persona 3, and Suicide Squad (it dominated the news/conversations). Then you get its actual release and Square Enix thought to kill any hype by holding VII’s State of Play, and demo. You figure it released on the same day as VII’s State of Play and Demo, which obviously overshadowed it. Then you had Helldivers 2 like you mentioned, followed by people talking about that, Skull & Bones (again, because it was bad), Xbox releasing Multiplatform titles, and Rebirth’s actual release.
I don’t know if releasing it in the Summer would’ve changed much for Foamstars, but Square Enix basically ensured it would get minimal engagement, and guaranteed its death by releasing it in Feb.
