I still find the website overdesigned, of course, but the technical execution worked perfectly for me.
(b) It is showing four products on the one page. Four. And seemingly jumping between them.
(c) Almost all of the text is very hard to read. It's light grey on dark grey. Dark grey on light grey.
(d) It doesn't even render at all on Safari/OSX.
The site "works" on my laptop, but not really on my phone - I'm not a fan of the overly flashy animation intro, again subjective.
I work on a small screen (12.5 inch) - here's my narrative as I load the site - the entire screen is taken up with a menu bar and a picture of the top of a device. I'm not sure what is on offer at first glance. Scrolling down there's a lovely story to draw me in by the founder, but still no mention of what the "thing" he is trying to sell is.
The first mention on the page of any product is "accessories" - so they sell accessories for phones I guess.....I scroll back up - aaaaah one of the menu items is "phone" - maybe they are selling a phone.
That was my user experience on my laptop. On my phone I was greeted with a black screen for quite a few seconds and then a website that was slow and dithering. I tried clicking through to a few sub pages but they froze and then broke my back button completely. Granted it's an old, slow barely internet enabled mobile with a not very well supported OS. Still, it's very seldom I don't get a reasonable experience on well coded websites.