While the windeployqt tool should in theory bundle all necessary Qt-dependencies, it’s often not working properly. You can try to debug with dedicated tools that scan required/missing dependencies so you can add them manually – but it’s a bit of effort to get a working setup.
To have a first quick solution you can try to copy over all the dependencies in the \Felgo\FelgoHotReload folder. It contains all of the Qt modules and libraries that Felgo Hot Reload uses, which are most of the available standard features.
You then at least have a working starting point that you can later strip down to only include actually used libraries in your final release.