What is the First Contact ?
I don't remember it and had no idea why Cato wanted to execute Marco ?
My anxiety went so high, thought I encountered the bad ending :(
(Spoilers so skip if you haven't finished the game.)
To make "First Contact" with a species means that you encounter another species from another planet from the first time. In Adastra, making First Contant without the Parents' agreement is illegal, and frowned upon. Hence why Amicus is such in big trouble.
If you encountered the "Bad Ending" as in the Human dies, it's because you haven't said "Yes" when previously, the Parents asked you to agree to work for them.