Nicely done!
Very creative take on the solar theme and overall gameplay. This felt quite unique compared to other puzzle games. I enjoy how the art is complimentary and colourful.
I found the buttons took me a while to figure out: I wasn't sure what was clickable at the start, and got confused by the arrow keys when there wasn't shade. I also found the difficulty ramped up pretty fast. I'm a pretty casual player so I tend to like having some easier levels to start with.
Once again nice job overall!