Use Google Chrome.
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Some tips on playing.
You have limited ammo: six clips per weapon.
You can suppress enemies by shooting at them, thus allowing you to advance.
Your health will regenerate if you stop taking damage for a few seconds.
The longer you hold down fire, the less accurate the revolver and machine pistol become.
The mortar guys zero in on you, so keep moving when you are being shelled.
The enemies have limited ammo.
The code is open source,
under the MIT license.
It includes The Render Engine by B. Fattori.