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I suggest considering adjustments to the rules:
1. In point 3, exclude the round-robin tournament and keep the group stage + playoffs. In this case, all players from the group can advance if there are few participants, for example, 3 people per group.
2. I suggest playing 2 games each against each other within the group. At the same time, the choice of castles for each game is sent immediately and can be different. In the playoffs, I suggest playing best-of-3.
3. In the second games, players switch colors. In the playoff stage, if there is a third game, the color is determined by a draw.
4. Regarding the gameplay mechanics: should the Griffin ability "strike from the sky" be considered a prohibited move if subordinate units attack the same cell from which they took off?