If all of you are stuck on defeating the Grinder, Max all the weapons first, Then use the one that does The Most Damage First then the first weapon (The pistol).
Space Pirates? They must been finding some treasure chests in the space but they cant even find one. All treasure chests is under Earth. Idiot space pirates..
Pro Tip: Once you have the vacuum, Place it on the middle and wreck the pinata and the vacuum will grab all the candy for easy money. (Im doing it already.)