It seems to be from a pre-made template, did you check the template ahead of time? Do you have visually impaired engineers, or do you do things like go through it with a screen reader/iOS VoiceOver every so often?
I'm not trying to be facetious here. I'm genuinely curious if there are market pressures that make a "good looking" website higher priority than an accessible one -- for example a need to look impressive to stake holders who are not visually impaired.
"We didn't think of that" would be an OK response :-). I'm just curious about the challenges for a startup in this kind of market and where one might have to make surprising compromises.
As the brother to a visually impaired person, I found the website fine. If only you could ship by his August 1 birthday! :)