Programming

JS is rightly criticized as a language, for lending itself to... less than ideal practices. Which is largely a result of it NOT being designed as a programming language. It was designed as a dead-simple scripting language for getting the most minimal of bells-and-whistles kinda things in the browser. So, it's worth noting that you might have to un-learn some bad habits someday, as you progress to other languages, or even just higher-level stuff in JS.

However, it's still an excellent choice as a starter language, on account of how dead-simple it was designed to be. And how dead-simple it is to start DOING things with it. And how is possibly the most-used language there is, ubiquitous in web development. And how MASSIVE the community around it is, and how many learning resources there are.

So yeah, go for it. GL;HF.

Absolutely worth it.

Even if you continue to favor Go, I find that the best devs in any language are the devs who know a lot of other languages very well.

That gives them the perspective to understand what any given language does particularly well, so that they can lean into that, and also be aware of paradigms they can borrow from other languages if the use case is appropriate.

Check out Phaser.

It's always worth to learn something new.

(Developer here) HTML, CSS and JS are always good to know anyway. For a video game, it depends if you want something really "video-game like" (in which case I advise to use a game engine the can be run in a browser, like Godot) or just an interactive interface with buttons, images and text.
For the latter, I would advise to use one the numerous JS frameworks (Solid, Svelte, Vue or whatever) but if you don't know JS at all, learning it from scratch could be good. Plus, you can make really pretty animations with CSS!
I know Go is a possibility for browsers, but I'm pretty sure it's not the best to make a game.

TLDR;

• You want a real video-game --> Godot
• You want a web interface --> SolidJS/Svelte (Both are good and easy to learn so the choice is yours) + CSS for animations

Yes it is.

There is nice gameengine to play with, like https://www.babylonjs.com/

Typescript or even JavaScript now are nice to work with.

Is it worth to learn javascript

Sure. Learn it and every other language you come across. Why wouldn't you?

Js/ts is fine to learn for those kind of games.

turning this into a webapp is a fine choice and if it's intended to run locally without sharing state with other players you can do this completly in browser with javascript no problem.

https://eloquentjavascript.net/ is a good book for learning js, that is freely available online.

JS is pretty easy to learn and there are SO many resources out there that will allow you pick it up easily so why not? Plus as someone who has been a web dev for decades now HTML, CSS, and JS are very valuable to learn. CSS especially as even many none web based stuff in the FOSS community utilize it for config customization. All of which is very easy to learn and then it opens you up for stuff outside of game dev like web development and webapp development.

Typescript is actually a pretty nice language (under the circumstances), you'll almost certainly be able to derive some real value from having learned it (even if it in the end would turn out to not be the best choice for your game).

Yes, just do it.

Knowing another language is always good, and the best thing about JavaScript is that there is so much available source code to read out there. It'll be super easy to learn and you'll be shocked at how much you can do in pure JS. I once wrote a graphics editor that blew my item mind...