Sorry to be blunt, this site is one of the worst ui/ux experience I've seen. For a website targeted towards programmers mainly, the lack of dark mode is a crime. And the first half of the page is just logo and the searchbar. Poorly named and designed logo and branding. 'sayhello' is a stupid name for a search engine catered towards programmers. Why make the product at all when clearly you havent done enough thinking on how users would approach and interact with your product.
This feedback is a bit harsh and not at all constructive towards their actual value proposition: a technical search engine for devs.
Dark mode is not a core value proposition.
(my guess is that) The logo and search bar take up a lot of space because they are mimicking the design of the Google.com landing page.
It seems like the bulk of their work has been on the search itself, so I would forgive them on logo and branding. It’s an early product so logo and branding can change.
For now, they just need constructive feedback on workflow and usability.