From what I got, or how I read it, this is what it meant. Being in my house is basically a representation of my ego in the world that surrounds it. The aliens, probably archetypal in nature--but of what I don't know--represent the idea of new. Something that is alien to me is something that is new or foreign like change from routine. The fact that it was breaking into my house meant that change was entering my life and confronting my ego. The way that I felt was genuine. I was scared. I attacked the alien and killed it, which didn't resolve anything and only left me feeling empty. So basically, change is coming and I can either violently fight it off, which according to my dream is exactly what my unconscious is showing me already doing, or work with it, let it into my house, let it affect my ego in whatever way it will, and carry on with it as a gude and not an enemy. That is what I got from my dream. I don't know of that is all that was being conveyed, but that is what I worked out. It took me a while to think of a ritual to perform in honor of the meeting with my unconscious, but I finally started my storyboards, which is a start.
While I was typing that last part, I thought of a ritual that I can do tomorrow. I am going to take a walk around my neighbour hood and notice all tha change. There is alot of it, but I haven't really thought about it all since it has all happened. It's time.
PEACE - Tristan