A few years back the authors of Continuum -- a black and white arcade game for 68k macs -- released the code for the game into the public domain. I recently finished porting it over to Javascript so it runs in the browser using Canvas for rendering and browser Audio Worklet for sound.

I've released all the code on Github at https://github.com/sam-mfb/continuum

And perhaps more the point -- you can play it here: https://continuumjs.com

The port has feature parity with the original game, other than a level editor, which I haven't added (yet).

There are also some places where I made improvements (multi-channel sound, fixing an issue with the background pattern, a modern collision system) -- but I've made these options in the settings so you can go back to the "original" by just checking a few boxes. It also has support for touch controls on the iPhone, but I warn you that's not such a great experience.

In any event, enjoy. The README I wrote on github has extensive notes about the development process. Happy to discuss that here as well if anyone is interested. Was a very fun project.

The game now records your gameplay and lets you export compact "replay" files that you can share to show off your skils.

Oh, wooooow! This takes me back!
More specifically it takes me back to taking turns with my brothers on my dad's 512k

just go straight to level 9 :)