I couldn't resist but think of the movie Contact of 1997. Awesome movie, go check it out everyone who's reading this and haven't seen the movie. 
It would be awesome to add the signal received in the movie, as a reference to the movie / easter egg with a low probability of detection. 
On the first levels of processing you can hear the signal as Ellie heard it for the first time and on the last stage of processing, have the image and audio transmited through the signal, if possible. 
Besides the mystery and the mechanics of the game, the 1st thing that drew me in, was how much it remided me of that movie. Listening to the unknown, making contact, all included in the movie, I got to experience that through this game and I loved it. I don't know if there is anyone else who has played this game having Contact in mind, but if there are, adding this little detail (the signal from the movie) will put a permanent smile on our faces the moment we hear it in game. 
Thats all. I love your game, without doubt one of my favourite this year. Far more worth than any of the garbage the AAA gaming industry is throwing at us lately. 
Thank you.