Interesting concept. It took about half a game before I realized which pieces could be connected. And I noticed a bug where I merged the white rook and bishop, then the black rook and bishop next turn, but the model for the black rook turned white.
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Thanks for the kind feedback. The mergable pieces are now explained on the main page of this game. We actually found the bug like 30 mins before release but it's only a visual bug and we were already pretty exhausted, that's why we cared less for this bug, though in a more polished version it should be fixed.