Maybe an upgrade system would remedy the boredom that sets in after a couple of fights. Let's say you collect points, which you can spend on your heroes, or on the strength / duration of their special skills, or on the strength of the different tiles (for example: how much HP you gain from a match, how much money you get from 3 yellow buildings, ...) this way, people can choose their own path a little more. other ideas: include more possibilites to shuffle the board, like a bomb or adding an explosive effect to a 5-match.
 "Super Duck Punch!"){kind=icon}
 "Island Escape"){kind=icon}
 "Arkandian Explorer"){kind=icon}
 "Boxhead the Christmas Nightmare"){kind=icon}
 "Earn to Die"){kind=icon}
 "Arkandian Revenant"){kind=icon}
 "The I of It"){kind=icon}
 "Soviet Rocket Giraffe Go Go Go!"){kind=icon}
 "The Gaulent"){kind=icon}
 "GemCraft Labyrinth"){kind=icon}
 "Elephant Quest"){kind=icon}
 "Tetris Labs"){kind=icon}
 "SRL"){kind=icon}
 "Bloons 2"){kind=icon}
 "Treadmillasaurus Rex"){kind=icon}
 "Tyrant"){kind=icon}
 "King's Guard"){kind=icon}
 "Elona Shooter"){kind=icon}
 "Santa Can Fly"){kind=icon}