If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Legions of stick men are trying to get into your town. Every day there will be a new wave, which will increase in size. Protect your defenses, if they are breached you will lose. Earn money by killing stick men, then spend it on upgrades at the end of each day. You will be able to buy different weapons and upgrades. Hire gunmen and anti-aircraft units to protect your defenses, masons to repair them or grenadiers to launch grenades at your enemies. You can only choose your weapon at the end of the day, so choose wisely.