Many things have been added and several bugs have been fixed.

+The ammo refill price at the shop is now proportional to the amount of bullets needed;
+Added unlockable gear (just medkits and ammo packs for now; they can be unlocked by completing the first and the second level);
+Added more skins (zombie, ninja and ghillie suit) and rings;
+Added melee crafting;
+Added grenades;
+Added grenade crafting;
+Added the SMG and the Sniper (they can be unlocked by completing the first and the second level of the game);
+Added player animations (shooting, reloading, throwing, hitting);
+Added the Book o’ Zombies (it shows you all the zombies that are present in a specific level, but only after completing it, of course);
+Added the log panel in the first level as well;
+Added the option to change the default keybinds;
+Zombies will now be slowed down for a moment when hit;
+Added a combo system;
+Added the option to limit spawned decals to a maximum of 20 at a time (in order to improve performance);
+Added the option to erase all progress made;

=The turret won’t shoot through walls anymore;
=The ammo refill price at the shop is now proportional to the amount of bullets needed;
=You will now get fewer bullets from pickups when using the shotgun;
=The intensity of the recoil effect has been reduced;
=The crafting system has been fixed (the quality of the weapon was always that of the most common material used before the fix);
=Changed the position of the ammo text so that it now stays next to the crosshair at all times;
=Fixed the bug where barrages wouldn’t cost any money to be built;
=Optimized the game for low-end PCs and improved the quality settings;
=Buffed level 1’s boss (his health will now increase as the player reaches a higher wave);
=The barrels won’t instantly explode after being hit anymore, now there’s a small delay before explosion (this leads to chained barrels no loger insta-exploding, thus better performance);
=Fixed various GUI bugs;
=Fixed the bug where the gun flash won’t disappear after shooting the gun then quickly pausing the game;
=Spikes and barricades are now more expensive (spikes: increased price from $150 to $400; barricades: increased price from $200 to $500);