Should reposition how the player holds that Shank weapon. That way when he/she does that jump attack, it would look just like in the Assassin's Creed games since that's what the Brotherhood set is referencing.
Some units are best left unpromoted even though you are able to do so. Everyone of these units have a unique ability and each and every one of them may prove useful in certain situations. A good example would be the Rogue's Steal ability. If the stage enables a wave where you can hire more troops, you would use the rogue's to gather as much gold as you can to hire as much troops as you can. The Priest can also be left untouched due to his Enchant Weapon ability if you pair him with a warrior or a thief but they need to be kept close.
I think the tape's music might be a secret code of some sort or maybe a secret message is hidden within the music. Might relate to the moonlight you first see in New Alcatrez, must be a direction to where Louis wanted Sonny to go. But who knows? If only the story would continue
 "Bit Heroes"){kind=icon}
 "Submachine: 32 chambers"){kind=icon}
 "Submachine 2: the lighthouse"){kind=icon}
 "Submachine 0: the ancient adventure"){kind=icon}
 "Battalion: Nemesis"){kind=icon}
 "Cursed Treasure 2"){kind=icon}
 "Royal Warfare"){kind=icon}
 "Bela Kovacs and The Trail of Blood"){kind=icon}
 "Lab of the Dead"){kind=icon}
 "Sonny"){kind=icon}
 "Castle Wars 2"){kind=icon}
 "Sonny 2"){kind=icon}