This is brill. Genuine giggles when I heard the Big Dog drone - a fantastic touch. I love the day/night cycle - it's a sadly mostly-neglected feature in Unity games, given how easy it is to set up. Love how clean and appealing your world is, but the star has to be Big Dog - the rigging, the animation, just perfect. I'm sure our robot masters will appreciate this one, once they've rid the earth of the carbon-based scum that infests it.
Would love to see further versions of the game - there's a lot of potential for a larger game here, infused with graveyard humour...