License type was previously only included in the download dialogue for the assets, but has now been added as a .txt file with the other items and clarified a little.

The rules clarification is not a new addition or a response to any violation. I've intentionally left the definition of what 'giving credit' means open, but would say that, as an example, the attribution of the asset to "TipTopTomCat" somewhere in the project is sufficient, such as the end-credits or wherever it makes sense.

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Creative Commons License 8-Bit Gameboy Songs Vol 2 (GB Studio) by TipTopTomCat is licensed under a Creative Commons Attribution-ShareAlike 4.0 International License (Creative Commons CC By-SA 4.0 DEED).

(You are free to share and adapt the work for commercial or non-commercial use, but you must give credit to the author (TipTopTomCat) and indicate if changes were made)

License Rules:

You CAN use these assets in your own free or paid projects.
You CAN modify these assets for use in your own projects.
You CANNOT distribute or resell these assets by themselves.
You CANNOT sell a modified version of these assets by themselves.
Credit has been requested for use of these assets, even after modification
If you do use these assets I'm always happy to see what you've made!