Nice job. I saw a portfolio designed as a Mac OS 9 interface a while back, but I think one of the best ones I’ve ever seen was one that modeled a sort of 3D, “UNIX‑esque” operating system [1].
A small bit of feedback: the progress bar during boot is a little too smooth. If you want to be accurate, it should technically move in ticks, where each tick corresponds to one of the segments.
[1] - https://joeyderuiter.me
it's been mentioned a few times so ill take a look into it. from memory i think it was a choice but i'll go back and reaccess the loading bar smoothness :)
and yeah there's some really cool one's out there!