If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
This hero is here to fight against the monsters in order to protect this village by a very interesting way. You can match all the same balls to eliminate, and then the role can use skills to beat the monsters.
←→ to move.
↑ to change.
↓ to down fast.
The same three balls together can make them eliminate.