Kinda reminds me of the Ace Attorney games, even the name is similar; pro and ace being synonyms of each other. Plus the way nonsense is displayed similar to objection.
For easy mega combo achievement just set up a chain from the bottom to the top leaving one odd colour in, then use a spell on the odd colour to set it off. Best done on level 1 with high armour and health.
I knew the merchant was going to be the boss, I mean what merchant would have shops in the middle of massive 100 floor dungeons with lots of strong monsters inside xD
 "The Journey Home"){kind=icon}
 "Kingdom Rush Frontiers"){kind=icon}
 "Socrates Jones: Pro Philosopher"){kind=icon}
 "They Took Our Candy"){kind=icon}
 "Dibbles: For The Greater Good"){kind=icon}
 "Elements of Arkandia"){kind=icon}
 "Diepix Arena 2"){kind=icon}
 "Bullseye (Interstellar Marines)"){kind=icon}
 "The Enchanted Cave"){kind=icon}