What a clever concept! It did weird me out at first that I couldn't pick what chess piece I was gonna move, but I very much like the concept of you entering a battle and actually being able to fight off a piece in combat.
I noticed that pieces have slightly different shooting patterns, which is a cool touch. It'd be interesting to see them move differently as well. I also love the way they attack! It caught me off guard.
I did stop attacking pieces at one point because baiting them to attack me instead made things easier, considering that only one piece would be able to attack me while I'd have adjacent allies with me.
The concept is honestly super cool to me though, and seeing an expansion of this would be interesting. Very good game!