Thanks for the contribution, @silvia-odwyer! It looks like a really cool project and it's very impressive that you have done this single-handedly! The pixels.js website itself is amazing as well, I wish my CSS skills were near your level haha.

Normally when people want to introduce a project, and not some feature(s) in particular, they use the blog category. In the development category we usually expect people to post about a feature, or multiple features, they have added in the last two weeks (or since the last time they posted on Utopian). Because of these guidelines I will be basing my review (mostly) on the commits you made in the last 14 days instead of the project in its entirety. I would also like to suggest you check out this guide, which was written by one of our (at the time) moderators, which describes a large part of our reviewing process (could be helpful to you).

I've only recently been getting into learning JavaScript properly, so take my feedback with a grain of salt, but: why are you mixing var, let and const. As far as I can tell it's recommended to not use var anymore, and just use let and const, but I've seen it in a few contributions and was wondering if there is a reason. Other than that everything looks great to me, although maybe you could add some comments explaining the cosmic_imgdata function for example, as it's not immediately clear to me (and probably others) what kind of wizardry is going on.

Looking forward to seeing more of your contributions in the future!

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