Pretty good, but Ammo-Drops are too random, maybe add to buy ammo as well. Some basic stats would be nice too, for example, make the lightradius even smaller, and let the player buy better flashlights. some hp-upgrades, add armor and weapon lvl-ups.
Drop the Burst and make autofire on pressed F/mousebutton and let the Fighter lollowthe mouse. Limit Rockets though or lengthen the time when rockets shoot. Exit/Pause Button is missing. Also i would prefer selcting the upgrade from a menu, since the upgrades seem to enter the sceen randomly you dont have always the time to choose what you actually want. I would play it more often with those addons.
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