Few problems that need to fix or improve: 1. Potion drop rate is low. At least drop a potion or two when you kill mob in the stage before the boss stage. 2. Sliding is difficult. 3. Equipment drop rate, gold, and hero are quite hard to obtain. 4. Melee hero gameplay need to be fine tuned. Too easy to get damage from mob when jump into them, few hits or collision then it is a KO for melee hero. 5. Chapter 4 has a small map but the mob attack rate and speed is crazy.