-Bots are now available for both Co Op and PvP.
-New weapon: Mortar. It fires in an arcing trajectory and has excellent splash damage.
-Added more drops to early game bosses.
-You can now see a list of stuff you've unlocked in the pause and map complete menus.
-Many projectiles are significantly faster. (Chaingun + scattergun in particular)
-Sprayer does more damage.
-Explosive and incendiary missiles now have better traills.
-Gas giants are now animated.
-New planet texture/shader on Ragequit.
-Hangar and Options menus are much easier to navigate with a controller.
-Upgrading a weapon now effects projectile speed and explosion damage/radius.
-Improved dynamic music system on some maps.
-New menu music.
-Bombs now have trails.
-Mines now spin slowly after you deploy them.
-Improved impact effect for scattergun.
-Many weapons have a bigger splash radius.
-Gyrojet projectiles turn faster.
-Missiles are more agile.
-Increased visibility of flames when an enemy is set on fire.
-Splitscreen now has its own button on the main menu.
-Made phobos a little easier.
-Reduced self damage on several splash weapons.