What are some alternatives?
When comparing Pixel Pix and CryPixels, you can also consider the following products
Responsive Pixel Art - It's exactly that... responsive pixel art 🙃
Aseprite - Aseprite is an art program dedicated to the creation of pixel art.
piCSSel-art - Draw pixel art with CSS!
TIC-80 - TIC-80 is a fantasy computer where you can make, play and share tiny games.
Pixel Art Studio - A purpose-built drawing tool for pixel artists
Pixel Art to CSS - Draw and animate pixel art, export the results to CSS