Ahh, good to be playing some RTS :)
The overall mood is very pleasant, I really liked the music and the voice audio. And looks super nice, when you move around with the camera. Good job!
One thing, that could improve the experience for me, would be the ability to "skip" the text-showing-sequence without skipping the text-box (e.g.: press "return" to instantly show the message), so you can more quickly read through the tutorial text, when impatient :)