Diamond Hollow 2

Shoot, upgrade, conquer enemies, defeat bosses, acquire achievements, collect gems, all in an attempt to save yourself and your gun from the clutches of the evil Professor.
Game Controls: 

Control your character with AD or Arrow Keys, jump with W/Space/Up, and use the mouse to aim and shoot (or switch control schemes in the options). As you acquire more guns, use QE or 1-4 or the mouse wheel to switch between them. After collecting diamonds, open the upgrades menu with tab or escape to upgrade your guns and skills to help conquer your foes.
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