Thanks to Alvin’s guide I’ve started learning Node.js (using the Express framework and socket.io library).
So with some small amount of code I’ve made green circles that can move around and aim. This is the first time in quite a long time that I’ve programmed purely for fun — I can see myself continuing to do so.
(Now trying to get the networking rules to open the port through my ISP, router, and Windows setup was not something I succeeded at. I might just spin up a small remote host for this purpose once I have more of a game around it.)