I've managed to install this successfully in arch linux and I can get the search window popup just fine
The problem that I have is that first there's nowhere any dropout menu and second I cannot insert emojis in any other application.
Because I only get the search window, I look for an emoji select it and then go to another app and paste it using Ctrl+V, nothing happens. I don't know why?
Also it would be nice if you could just type and get the emojis directly in our desired applications. In the readme it says this is experimental but there's no instruction on how to enable or test this?