The idea is interesting and I think if you put some work into this game or concept this could work.
After spamming right click I have found that the first knight (the blue one) can not move or attack but the other knight, the green one, could do everything.
If you add some kind of progression or upgrades which these knight could pick up or use it where only one of them gets an upgrade, the player will have to think and plan his next moves. And yes, I think about how Jacob and Esau works in The Binding of Isaac.
And lastly, if you can check my game and tell me how should I make it better I will be grateful.