I'm skeptical too,
and I started at age 10 (C64, though, not html+css+javascript).
I dunno if such skepticism is healthy or not, but looking at the source I feel that it contains too many things that need explaining to a 9yo: `DOCTYPE` and all those `META` tags correctly set when they make no difference to the game, why `box-sizing` has to be specified, all those different `display` attributes correctly set for the display that is needed for that element, what the `ease-in-out` means ...
And that's without even getting to the Javascript stuff, like why use const vs let, why use backticks and interpolation, things commented out temporarily instead of removed, the way the code is modularised, etc
In short, there are too many irrelevant-to-the-output best practices implemented that, I feel (after seeing what a lot of beginner/student programmers produce) demonstrates a level of experience that cannot come from "My First Game".
The signs of an experienced hand in the development is, to me, unmistakable.
I dunno if such skepticism is healthy or not, but looking at the source I feel that it contains too many things that need explaining to a 9yo: `DOCTYPE` and all those `META` tags correctly set when they make no difference to the game, why `box-sizing` has to be specified, all those different `display` attributes correctly set for the display that is needed for that element, what the `ease-in-out` means ...
And that's without even getting to the Javascript stuff, like why use const vs let, why use backticks and interpolation, things commented out temporarily instead of removed, the way the code is modularised, etc
In short, there are too many irrelevant-to-the-output best practices implemented that, I feel (after seeing what a lot of beginner/student programmers produce) demonstrates a level of experience that cannot come from "My First Game".
The signs of an experienced hand in the development is, to me, unmistakable.