hi bro here is the link of that asset pack i also really like their 2d piexl , and they sell it for 5$ per pack , and they have about 50 - 60 asset packs like this
my advice if you like it and have a lot of money or want to make 2d games with piexl graphics like this then buy it there
http://www.akashics.moe/terms-of-use/ ( hey bro link and this inbox never virut )
good luck you game ^^