it is the other way around. there is no requirement to provide a binary, but if we do have the binary, the source code needs to be provided as well
CC4 for the graphical assets
GPLv3 for the programming code
Also see https://itch.io/post/13347732
this only applies to distribution in a physical object (section 6c.1 of the gplv3) but what applies here is (at least how i see it) section 6d which reads as follows:
> Convey the object code by offering access from a designated place (gratis or for a charge), and offer equivalent access to the Corresponding Source in the same way through the same place at no further charge.
(this is only an excerpt)
the "equivalent access" is what i think is not given, since we have gratis access to the binary, but not to the source code.
but they promised to clear that up soooo...
cute game btw