Hello theloon, thanks for reaching out! That is a very interesting reflection indeed, as I never encounter this situation before.
Well, I think demos are ok as imo they count as an iteration towards an End Product.
I would say that different editions are ok too, like a PC version + a console version for instance, as long as it can qualify as the same game, and the other variations are ports.
I don't want my licencing to be too restrictive, so I am open to consider other alternatives like CC-by-SAor something.
Or I could keep the 1$ licence for 1 End Product and propose another choice with a more extended one, like a Pro Licence for like 3$ maybe?