Hi Vlad,
build server is currently only available for Felgo 1, because for Felgo 2 and Qt 5 we allow local building and C++ integration which is not really possible with a remote build solution.
However, the existing build server already compiles the QML files as qrc (Qt resource system) which hides any game logic from your game users.
And for Felgo 2, you can do the same (as shown in our demos) to hide the qml code and assets from others. Also, you can use Digia’s offering together with Felgo 2 if you have a Qt Mobile license.
Cheers, Chris