In ThermoStorm you play as a secret agent, using the in game objectives (holding C) you can find out what you’re looking for.
It’s important to remember that you can upgrade your character and take advantage of buying weapons before each mission. Each level has it’s own advantages for different weapons. You may find machine guns work best in caves and sniper rifles work best when you’ve got a long range.
Press G to throw grenades
The game is saved after each level to your flash player (not to your user account).