It's not complete, but you can preorder it by finding your way to the store at https://pixelart.academy/. I was able to reach the preorder page in Chrome on Mac (http://d.pr/i/YdcRmZ), but you might like to report bugs to the author if the game's not working for you: https://www.retronator.com/ask
The author also maintains the Retronator pixel art technical blog at https://medium.com/retronator-magazine/, a personal blog with the same name at https://www.retronator.com/, and a Patreon at https://www.patreon.com/retro.
It's not complete, but you can preorder it by finding your way to the store at https://pixelart.academy/. I was able to reach the preorder page in Chrome on Mac (http://d.pr/i/YdcRmZ), but you might like to report bugs to the author if the game's not working for you: https://www.retronator.com/ask
The author also maintains the Retronator pixel art technical blog at https://medium.com/retronator-magazine/, a personal blog with the same name at https://www.retronator.com/, and a Patreon at https://www.patreon.com/retro.