Interesting icon set. I love the idea behind it, but looking at their icon preview at https://i0.wp.com/codefisher.org/wp-content/uploads/2022/08/..., I noticed that some images look great at higher resolutions (the star), while others look like a bad hqx/xbrz job, with a mix of curved, pixel-aligned (lock, book, anchor, monitor stand), and blurred features (book stripes), with inconsistent line widths (the house's roof and bushes, the computer stand and anchor).
Someone made the effort and ported them to .svg [1]
Donationware
[1]: https://codefisher.org/pastel-svg/