From my point of view the website looks ok. I like its UI. Now some technical things. I have crawled it with my tool Smart SEO Auditor (https://smart-seo-tool.com/) and found some issues. 1. A lot of pages without Description. 2. Many pages with nonoptimal Title. 3. I have not found duplicates, but I didn't crawl the whole website. So, it can be. 4. Server response time is too high, more than 1 sec. The reason can be on website side, or it can be slow hosting. 5. More then 10 JS files on a page. (13-14 JavaScript files). I would suggest to bundle them into 1. (The same can be done for CSS.) So, not much to fix. But if you did that, you would have better ranking. Please crawl website with any tool to find all On-page SEO issues.
I like the layout. Very easy to use. There are a few pages missing content like How to Install and FAQs, but I'm sure you knew this.