This was a cute game. The art style and music were nice and helped set the mood. I was particularly fond of the scenes that had you imaging the sunlight to help you see the background, and then returning to the darker image afterwards. I also liked that you gave both the option to scroll back to previous text and had a history tab to reread the story.
I played the game mostly with mouse, but I thought it was nice having the option to play with solely with the keyboard as well. I did try using the self voicing option, but I didn't hear any spoken voice. I'm unfamiliar with Ren'py,, so I'm not sure if it's a standard feature in it. If possible, you may want make sure it's fully implemented or removed.
I also found the small text at the bottom, save, load, options, etc, was hard to read, particularly when they were against a lighter colored background. Giving it darker boarder might help make it easier to read.
Overall, I think you did a good job with this.