I'm actually not quite sure if this would be enough to be considered a genre, but the idea I have is to make games that run entirely in the HTML/JS consoles of browsers. I know this type of thing already exists for other forms of consoles, but the idea I have with this is that a player only needs to copy and paste the game's script into the console and they're good to go. This can allow players to bypass firewalls since almost all firewalls allow some sort of modern browser and they rarely are made to check what specific code is being run in those browsers, thus the game can be played without any problems. An example of the usefulness is the ability to play these games in schools where game websites have been banned. Granted, video games tend to be banned for a reason, but as is the case for my school, sometimes there's a districtwide firewall that inhibits play even at schools that permit it. So, if a student has one of these types of console games, all they have to do is email it to themselves and copy the code into the console at school and they can start playing.

As a proof of concept, I have "Attack of the E's!", which I made entirely for this purpose:

https://ldgamingexpress.itch.io/attack-of-the-es

Does this idea sound plausible to anyone else, or is it too niche to really be worth much?

I think its a pretty cute idea. Maybe start by hosting a game jam to hopefully encourage developers to try this idea out? and see if it goes somewhere.

Pasting external code into a webpage is not a new concept. Before it was the console, browsers accepted a JavaScript statement into the URL bar, so people did stuff like javascript:(function(){console.log("Hi!");}()). Firefox doesn’t seem to do this anymore, though.

Putting it in the console does seem like a neat “modern” version of the idea, though. I think it could take off, but it will remain a niche (as are most indie games, anyway).