Thank you! This was made in Pico 8, which makes it pretty easy to do this stuff. Pico 8 is an all in one engine that has a code editor, sprite editor, map SFX and music editors. It allows exporting to Windows Linux and Mac binaries, PNG, and HTML.
It's described as a fantasy console - being that it imitates the constraints of that era such as limited memory and space for sprites, etc. Despite this it's super fun! It promotes smaller better games, and almost all of my recent projects have been in it. I've never finished so many games before haha.