The game didn't work for me in Brave, so I'm using ye olde Firefox.
1) Is there any way to skip dialogues?
***SPOILERS***
2) Is there any pattern to the shadows appearances/disappearances?
Apart from the speed of the shadow, my biggest criticism of this game is the lack of consistency when it comes to lighting. I can only conclude that the story elements override normal lighting.
...Boy, these credits drag on. Nice music, though.