This is an interesting take on chess. I like the idea behind it, though there are a lot of concepts to learn. During gameplay some of the mechanics didn't feel good. Such as jumping an enemy and it doing nothing, but then they can jump yours to take it. I'm thinking it may have been due to how many pieces were nearby, but it could use with clarifying how that works. Is it the 4 base directions, or does it include diagonals. Is it just one piece touching, or does it need more than one.
The cavalry only being able to jump to alternating rows feels very limiting for them. I was trying to reposition one and realized this limit prevented them from moving where I wanted. It does add some strategy, but made me want to use them less. Their ability to chain jumps does add some power to them, and I was caught off-guard several times by the enemy chaining them.
It appears that the archers may only have 3 shots. I'm not seeing that in the tutorial.
The tutorial helps, but there is so much that it takes several times playing and going back to look at it. I think a more interactive tutorial, such as a preset game board with you guiding the player with instructions and having them try things out, would be helpful. I think some key things to show would be when doing the same thing has different results, such as jumping sometimes taking a piece.
I'm not a fan of the really tall layout and needing to scroll to see pieces, especially when the enemy is moving off-screen. I know the move is listed at the top, but that is small and hard to read. If an enemy is moving off screen, the screen should move to focus on them so you can clearly see the move, then move back to where it was. When I first opened it, the window was too narrow for the interactive tutorial, and I had to widen it to see all the buttons. After I started the main game, I made the window very narrow and tall so I could see the entire board all at once. A zoom option would be nice.
It is nice that you support multiple languages for most of the game, though much of the top UI on the starting page is not translated.