If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
This is a real time strategy game. You are sending army and supporting by archery. There are 5 stage which each stage has different 3 mode and that means there are 15 stage you can finish. Your kingdom is attacked so you have to defend it but you also have to fight back. Maybe you send army in all lane and get the victory or you defend in early with tower to deposit your gold and fight back when it is enough. Something like that.
Click to shoot as an archer.
Space and click on a lane to send army.