The animal part caught me offguard :D Definetly you have a really cool concept a CHAOS BUTTON!
I loved the friends notes they are definetly a good way of giving tutorial !
So my biggest letdown was the enviroment changes. There is almost no diffrence between shooting animals astroids or mines it feels like a wasted opportunity. I would like to see some gameplay changes that way you can keep the player more engaged :]
The most important thing in this game is the chaos button but the game doesnt force you in anyway to press it :/ there should be consequences of not pressing the button.
Other than these issues i think you made an amazing game ! I would like to play again if you decide to work on it :D Nice work !