Optimizing a formation is tricky, because it depends on which campaign you're on, what gear your Crusaders have, and the Talents purchased. Easier for you to experiment to find which Crusader is your best DPS for the moment, and just level them.
Seems like I've come across some unrefined bits: Formations not going back to what they saved as, buff ads not loading the second time around, achievements only show up if I refresh the page...
It's fun for a bit, but then makes me just want to leave it and not even look at it again.
Thanks for the feedback. So on the same free play, the formation isn't loading properly? Do you have all the Crusaders available that are in the formation? For the buff ads, you can watch one, but not another one? Which achievements only show up when you refresh the page? Do you have an example? If it's the Kong ones, there could be a delay in talking to their system that a refresh is aiding in getting around.
In Spirit World 6 the platform that you have to ride down the death slide keeps getting stuck due to inconsistent physics.
Also, it's the only level that I've actually had to mute because the popping of the level is way too loud for someone playing with headphones and ridiculously distracting when trying to platform hop. :(
after the 9th level in survival the game froze on me. well it didn't exactly freeze, cuz the music was still going and I was able to see the mouse move over it.
but it stopped sending in waves... :(
 "Crusaders of the Lost Idols"){kind=icon}
 "The Necronomicon"){kind=icon}
 "Coinbox Hero"){kind=icon}
 "BioGems"){kind=icon}
 "The End"){kind=icon}
 "simian.interface"){kind=icon}
 "Chronicles of Blood"){kind=icon}
 "Innkeeper"){kind=icon}
 "Screw the Nut Mobile"){kind=icon}
 "Dreamsong Catcher"){kind=icon}
 "Villainous"){kind=icon}
 "Sky Island"){kind=icon}
 "Edmus"){kind=icon}
 "DuckLife3: Evolution"){kind=icon}
 "Ninja Hamsters vs Robots"){kind=icon}
 "Mushroom Madness 2"){kind=icon}
 "Defend your Honor!"){kind=icon}
 "Factory Balls 2"){kind=icon}
 "Bounce 1.9"){kind=icon}
Optimizing a formation is tricky, because it depends on which campaign you're on, what gear your Crusaders have, and the Talents purchased. Easier for you to experiment to find which Crusader is your best DPS for the moment, and just level them.