It was made to be a "free culture" license (Follow the link because it answers your question). And as additional recommendation (after reading first link ) I recommend you to know what is "free software" is to compare with what you know...
About suggestion... I suggest you to choose license you want to use for this asset... If you decided to choose your custom license, you need to remove CC-BY4 from itch metadata because it is disinformation. If you decided to stick with CC-BY4, you need to edit description accordingly to CC-BY4 (And I recommend to add the name of the license)...