I used to play go a long time agom, so I was able to beat this first try with plenty of moves left to go, especially when I got the upgrade where remaining moves convert into life points for the game.
I think this could be expanded upon and turned into a more full-fledged baduk roguelike. Really cool proof of concept with a nice execution to it. I particularly like the animations at the start of each match, where Yìnan places multiple stones, while the board is shaking with some fun and frantic animated effects going off at the sides of the screen.
I also really appreciate the names with the tonal indicators. Very clearly this game was made with a love of weiqi. I really hope you can expand this into something larger and truly special. Best of luck to you, and thanks for the game!