Hi again, after reading lot of threads regarding similar issues, I have concluded the next:
Yes, I can make the demo as the last screenshot provided (as far as I have understood). Anyway, of course, a confirmation would be really appreciated.
Some interesting considerations (as far as I have understood, again) may be that I’m the owner of the ‘game’, so it may have sense to add a watermark. In addition, it doesn’t include a credits section, so an artist signature is fine, without needing to add any other credits nor references to ‘third parties’ (as pointed here, for example: https://answers.unrealengine.com/questions/950108/ue4-credits-clarification.html). Maybe could be useful to omit what kind of specific work I did, and simply add the signature.
Thank you again and best regards