Consider having 2 ways that alligence can change. I won quite a few times when the enemy units near the enemy king switched to my team and I could kill him instantly. Maybe be based around what units people are near. So if units are near the king they have a very low chance of switching sides either way. When a knight is near by other units have a greater chance to switch to the knights colour and so on so forth, more units which balance their attack and range with their ability to change sides could make this an interesting tactics game which promotes keeping units together to stop them from switching. Think it could work as a pirate theme.
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Thanks for the advice, I also love pirates, and I agree that it would be awesome. As for more complex betrayal, that is something we plan on trying in a build that we'll uppload monday/tuesday (after that we won't continue working on this game, but we'll maybe redo it after we get some more games under our belt (definetely with a pirate them, if I can help it)).