You'll find that destroying boxes and blowing up enemies will sometimes yield small flashing green objects. These represent various upgrades you can get (minus the cash bonus). The following is a list of all the power-ups in the game:
|Ammo||Increases your total ammo. Only affects upgraded weapons.|
|Auto||Makes your normal gun fully automatic. Just hold fire.|
|Baz||The bazooka is a single, very strong laser projectile that can go through multiple enemies. It is the strongest weapon in the game.|
|Score||Gives you bonus cash (points).|
|Flame||A flame thrower that extends from your gun. Uses a lot of ammo, but is good against large targets.|
|Laser||A rapid firing projectile that is stronger than the regular gun.|
Throughout the game you'll come across turrets and vehicles that you can control. Simply jump near them to attach yourself to them, and jump again (sometimes in combination with the ) to unjoin yourself from the vehicle. All vehicles have their own health (although some are invincible), but when they aren't being controlled, they can only be destroyed by you.