I suggest changing the following point:
3. Choosing colors and castles

Instead of: The player who starts drawing first chooses a castle from the three remaining, the second player chooses from the two remaining and the color they want to play with.
change to: The player who starts drawing first chooses a castle from the three remaining, the second player also chooses from the three remaining and the color they want to play with. In this case, if the second player chooses the same castle, then the first player chooses a hero first. Or, by mutual agreement, choose heroes randomly.

That is, I suggest leaving the possibility to play with the same castles.
I would be glad to hear your opinion, friends.