More Instructions to Follow

Your phone buzzes. You have an email from an unknown address... and the timestamp shows a date in the future. Are these legitimate cries for help across time? Or just some elaborate hoax? You decide whether to play along or forge your own way. Because no matter what you do, there will always be more instructions to follow.
Jam year: 
2018
Diversifiers: 
AUDIO - Write The Theme Tune, Sing The Theme Tune
DESIGN - I’ll be there in a minute
DESIGN - Feathered Friends
NARRATIVE - Epistolary
Platforms: 
MS Windows
Tools and Technologies: 
Unity (any product)
Technology Notes: 
Don't touch the gorilla
Installation Instructions: 

Source files require Unity.

Game Stills: