Would love to hear a bit about the tech stack or engine you used (if any)!
They reference these on the site's about page:
https://chr15m.itch.io/roguelike-browser-boilerplate
https://ondras.github.io/rot.js/hp/
https://www.oryxdesignlab.com/products/tiny-galaxy-tileset
https://nostalgic-css.github.io/NES.css/
https://sfxr.me/
alt Hacker News
They reference these on the site's about page:
https://chr15m.itch.io/roguelike-browser-boilerplate
https://ondras.github.io/rot.js/hp/
https://www.oryxdesignlab.com/products/tiny-galaxy-tileset
https://nostalgic-css.github.io/NES.css/
https://sfxr.me/