I wish it would start at a human size and keep growing until it became a giant in every sense.

I agree, the "Queen" is already bigger than her UFO right at the beginning, so if she could be closer to a human size when the game start it would make more sense and her growth would feel more impactful IMHO. (When I said closer to a human size, she should still be a little taller like 3 meters or so.)

Nonetheless, I had fun playing this game and can't wait to see what's coming next.

I agree that a smaller size gives more contrast and makes the growth more exciting. For the first patch I've adjusted the queen down a bit in size for the first patch but its about as small as I can make her without breaking game mechanics - as her hands would be hilariously small if we made her too tiny, she's actually supposed to be placing the turrets down too! 

We're abstracting a bit that she absorbed the size of the people on the farm before the reigns were handed over to the player.