You say the license is "CC by 4.0" but link to the CC-BY-SA 4.0... that's a pretty big difference.
Would you mind bringing the two into agreement?
Fixed it, it's CC-BY-SA 4.0. Sorry.
No problem. I’ve updated the entry in my resources list.
(And sorry for taking so long to reply. Itch.io doesn’t notify me of new messages via e-mail and I can’t figure out how to fix that.)