If the game freezes, just click inside it (games can get unresponsive if you click elsewhere on the page).
Your ship has crash landed on a hostile planet inhabited by the horrible and terrifying emo menace. Upgrade your arsenal with increasingly more amazing weapons. Upgrade your ship to defend and heal itself. Keep your upgrades maxed and your finger on the trigger.
Mouse - Aim / Shoot.
1-4 - Weapons.