I really liked the theme and the story this game told. It's impressive that you managed to get me so immersed with such a short game, so compliments on that! The ending (you know what I mean) came out of nowhere, though, because I didn't see the signs throughout the game. I was so busy with the monitors, that I didn't see it. I think you should really 'force' the player into that direction so that he can see it. I think it would also help if the protagonist reacted to it.
I spend like 5 minutes on my outro discussing the ending XD If you are interested, you can see my Let's play video in the YouTube-link below.