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(+1)

https://creativecommons.org/faq/#When_is_my_use_considered_an_adaptation.3F

Thank you for bringing this to my attention.

After reading through the creativecommons.org site and getting some further advice, it sounds like although using the sprites in games is possible, it is heavily restricted. So I'll be changing the licenses for my assets over the next couple of days after I do a bit more research.