If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Great festive twist on the best flash shooter ever, Counterforce. Similarly it consists of three 60 second rounds where your objective is to shoot the bad guys as accurately as possible, but this time the bad guys are all Santa!
Mouse - Aim / Shoot.
R - Reload.
Spacebar - Rifle / Pistol.