Come on my friend, 16x16-dungeon-tileset was published in May 2017, it's probably older than Pixel Studio you're talking about (not sure which one it is though, I found 3 pieces of software with the same name -- glad to see I'm not the only one struggling with naming things :D).
In any case, I'm happy thee are using the characters :)
(It might be the NFT one I believe :/ so I guess less happy)
<3