This is a performance demo more than anything, so I would like feedback on how it runs for you. I get excellent performance with Chrome and Firefox, however the particles choke IE to death. WebGL is set to auto detect. I will be adding a "low performance" option that uses animated effects instead of particles.
Controls are simple, aim with the mouse and shoot with the left mouse button.
Your country is under attack from invading forces and its up to you to stop them. Shoot down the paratroopers before they can land, and the occasional drone will swoop in and try to bomb you.
The only playable level at the moment has no balance to it, as I just put it together to test everything, so the enemies come at random and sometimes overwhelm you, and sometimes don't come fast enough, and for testing the firing rate is higher than it will be in the final version. If enemies manage to touch down they will plant a bomb on your turret. After 4 hits by either drone bombs or planted bombs then its game over.
Each shot fired costs you points, you earn points by killing enemies. You also lose points if landed enemies manage to escape off the screen. Points will be used to open up additional levels, and repair damaged turrets. The levels will all have 3 objectives ala 3D Mario games, so each level will need to be played 3 different times each some of which include boss battles. If a turret is destroyed you will have to fix it to continue, if all your turrets are destroyed the game is over. You will also have power ups to help you, and the game will have achievements and online high score lists, all of which is still to come.
Remember, this is a demo of sorts so its not balanced at all. Just blast away and let me know how it performs for you and what browser you are using, and let me know what you think!