Purplonium Pro Suit is invincible since Dancing Fire at level 3 recharges before the shield from it runs out. Slow way to kill some tough bosses (although may be lagg dependent).
Please make it so you can't push animals into walls or at least so you can pick up sheep and cows. I lost a sheep by pushing it off screen on accident >.>
Colossal Aurochs is a bit too powerful in my opinion. When compared with the Warship from Vespitole, the Warship attacks the same number of times, both attack on turn only, but Aurochs costs 3 less gold and has a 50% chance of returning to your hand when its HP reaches 0. Finally, it is only a scarce card while Warship is rare.
Very nice game, premium content is annoying but I understand its purpose and it doesn't take much away from the game playing without it. A couple things that would be nice is a counter that shows your progress on challenges; I found it annoying that I couldn't see how much damage I took in the less than 30 damage challenge. Also a level progress meterwould be great.
 "Epic Boss Fighter 2"){kind=icon}
 "The Enchanted Cave 2"){kind=icon}
 "Rogue Legend: Tame the Wild"){kind=icon}
 "Clicker Heroes"){kind=icon}
 "Kick The Critter"){kind=icon}
 "Thrones of Fantasy"){kind=icon}
 "War of Omens"){kind=icon}
 "2048 Flash"){kind=icon}
 "Realm of the Mad God"){kind=icon}
 "Versus Umbra"){kind=icon}
 "Platform Racing 2"){kind=icon}