My only issue is with the game occasionally lagging for a second, sometimes. I think this is more of an issue with Flash, though. Probably because it's the 64-bit version, or something.
I tried throwing the airplane backwards on Chrome, Firefox, and Opera. Firefox got stuck for a while and then Flash crashed; Opera got stuck for a while, and then the plane stalled; Chrome just made the plane fly straight up.
Certainly much easier than the first only in that there was no puzzle that required waiting a while on a particular screen.
Definitely not painfully difficult, but not simple, by any means. It's an all-around enjoyable challenge, and I look forward to the next installment.
The only issue I have is that it's difficult to tell what can and cannot kill the humans. I thought the Tetris piece or the fridge was a good thing. Nope.
I turned off the power on 12 because I messed up. Then, the game messed up. All the buttons don't work and the game thinks power is still on even though the button is red. I'm going to refresh and hope it saved.
 "SCGMD4"){kind=icon}
 "Flight"){kind=icon}
 "Frantic Frigates"){kind=icon}
 "Synapsis 2"){kind=icon}
 "Disperse!"){kind=icon}
 "Four Second Firestorm"){kind=icon}
 "Electric Box"){kind=icon}