A great experience! The attention to detail and use of repeated imagery really sells the emotional core of the narrative. Interactivity isn't exactly commonplace in Ren'py games, so to see you use it to expand the story and the characters involved, even if by a small amount, is a welcoming breath of fresh air. The art's top notch as well.
Lack of sound aside (trust me, I understand how daunting it is to find and implement sound and music when you have all this other stuff to do as a solo developer), the bird is, sadly, very distracting, and hurts the somber tone of the narrative. Not to a serious degree, though. Also, it might just be me, but I found Cole's father's motivations to be somewhat unclear, even after a second playthrough. Perhaps it's meant to be left for interpretation, but I found most of the other threads to be clear.
Keep up the good work!
(Side note: I commend the subtle hinting in the title and main menu art)