Hey GuiWong,
I just finished a round after completing the tutorial.
This is an amazing idea. It seems hard to grasp at first since there's a lot of information but when I started playing it actually clicked really fast. The Info window on the right side of the screen is super helpful!
Quick question: you hinted some information about old rules of chess during the tutorial. Is this how chess was played a long time ago?
Anyways, it is an amazing and original idea on this theme, congrats on the entry! :)
P. S. with some chill music I think this has the potential to become a fully released, coffee-break puzzle game! :)