I am not sure if you noticed or not, but whenever you are destroying a pot or various objects, you might find Gold inside them! Since Gold is something that will help you unlock more characters you should think about starting to collect enough so that you can unlock them. I suggest that you start destroying all the destroyable items that you can find in a stage, but ONLY after you made sure that you do not need them for anything else. If you need to destroy some enemies beforehand, you should then attack them with the objects first before you actually think about only destroying them. When you throw an object into either an enemy or a wall, the item will be destroyed and it will spill whatever it is inside of it, which takes us to the next point!