Hi,
Apologies for the (very) late reply - haven't done anything art related in quite a while.
I'm glad you like the pack. Seeing as this is a paid premium pack, if purchased, you're free to use the assets for all purposes, including commercial. While appreciated, attribution is not required.
The free, smaller, 16x16 counterpart to this pack is available under CC BY-ND 4.0.
Cheers.