The end bosses with the multi bladed spinning arms, will destroy all of your cargo bays. Then when the magnet comes in at the end it is ether unable to or doesn't have enough time to pick up all the lost cargo. Making some levels a negative gain.
I've run into a bug ware every level I start makes the shit pull to the right. It works ok after I reload the page, but it happens every new level. I'm at danger level 37
 "Galaxy Siege 3"){kind=icon}
 "StrikeForce Kitty"){kind=icon}