Guns

Overview
There are two types of weapons in the game: Light and Heavy Guns. Heavy Guns are, in general, more powerful, expensive, and harder to get than Light Guns. Obtaining them requires you to either kill enemies and collect their drops, or buy them at the stores/traders currently available in the game. Light guns rotate to face enemies when they are within a small range, so you don't have to aim, while heavy guns do not. Weapons shoot Projectiles.

Light Guns
Light guns are the earliest weapons available in the game, most having a more powerful heavy gun equivalent, such as the blaster and the heavy blaster. The only exception to this is the wave gun, which appears to only exist in light gun form. These rotate to automatically target enemies. A list of light guns:
 * Blaster
 * Machine Gun
 * Bomber
 * Pirate Shotgun
 * Pirate Plasma Gun
 * Cannon
 * EM Gun
 * Wave Gun

Heavy Guns
Heavy guns are the weapons you'll be using at the end of the game. They usually shoot faster than their light counterparts. Consequently, there are more of them than light guns. A list of heavy guns:
 * Heavy Blaster
 * Heavy Machine Gun
 * Heavy Bomber
 * Rocket Launcher
 * Imperial Shotgun
 * Heavy Plasma Gun
 * Heavy Cannon
 * Nail Gun
 * Rail Gun
 * Missile Launcher
 * Missile Pad
 * Miner
 * Heavy EM Gun

Trivia

 * Dps reported in-game only includes the damage of the projectiles and the fire rate of the weapon, but does not take into account reload time.