I managed to organize my thoughts and my complex story into a simple 3 act structure. Here is how it looks:
By doing this I will be able to write my script in a more organized matter.
I also defined some goals and the subtext of the story:
After that, I decided to make the first draft of my script. I am very happy with the results. The formatting looks good.
I decided not to use too much dialogue, keeping the main character mute and having the aliens only say small sounds.
I also created a moodboard with the visual style I want to achieve.