I had a look but I can't comment how good it is - which is where launching a site or web service becomes tricky. IMO, the site needs a fall back keyboard key to launch the query to get around a non functional script (for sending off the query.) I am probably the one in a thousand user who has an extensive deny list, which includes a handful of api services. No doubt it works ok for those who have the latest systems and a phone model that's only just been released.
Many years ago there used to be services that offered virtual browser / environments so developers could test as much as they could themselves but with the advent of smart phones made it just a bit too hard offer a comprehensive range.
Quick edit for clarity.
So for your site, imagine using google search bar, one is able to type in the query but when hitting the spy glass icon nothing happens. Nor does hitting the return key do a thing - but in your instance you have a text box so the return key just enters a new line in that box.
The behaviour of the launch icon [which I gather on your site would be the up arrow in a circular button] not working is not unique to your site, I experience this often enough, and no doubt I have blocked the host of one of the APIs used to build the gui instance to return the query data.