The work was pretty great for Homeworld... there isn't much more you can do.
I actually liked that video and watched it to the end with no doubt. Even felt... something ... at the situation of their civilization and when the Bentusi appeared I noticed something was missing cus of the ending (even though I never played homeworld, just HW cataclysm and HW2), now I noticed it's just part 1 of 4. That made me happy to see That there'll be a continuation.
btw, you can easely cheat on the maps to make the movie making faster and easier(as I think you already played the game before), you already have some fans to push and tease you to make it faster