If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Your spaceship crashed, you are the lone survivor. The planet is inhabited by some gruesome and bloodthirsty alien creatures, and they haven't taken a shine to you! Survive as long as you can as you splatter their sorry alien corpses all over the planet! Look out for the bonuses to help you, and learn new ability's to increase your chances of making it!
W, A, S, D / Arrow Keys - Move.
Mouse - Aim / Shoot.
Spacebar - Perks Screen.