Great game. I don't remember what level it was, but there was an issue with on of them not letting me remove blocks even if they were removable. Refreshing the page fixed it, though.
Personally, the game is ruined for me by the crap penguin target selection. It's not fun failing missions because your penguin will just continue to run into a wall for 30 seconds, it's frustrating.
The pistol is definitely all you need to kill everything. Use it exclusively and it levels up quick and you has plenty of stopping power. Don't bother with the last upgrade, the extra 10 damage isn't worth 4 less shots per reload.
There's nothing more frustrating than getting to the end of a level and accidentally clicking a mine instead of flagging it because they both use the same button.
The tortoises do no damage, the meteor and lightning maces are useless because they can only be used after all your animals have been killed already, and a couple rhinos and penguins aren't nearly enough.
Seriously, what the hell am I supposed to do with a bunch of tortoises and maces on 4-15? That's all it will give me, and neither is any good for killing all those powerful enemies.
I can't play because it won't let me use arrow keys to move. I use a laptop, and it won't let me use the trackpad and click at the same time as I use letter keys.
Something else to add to webkinz9's strategy is that, if you have a touchscreen, you don't need to move the ball through a path. You can just click where you want it to go and it will teleport there.
 "3 Slices 2"){kind=icon}
 "Sugar, sugar"){kind=icon}
 "Unpuzzle 2"){kind=icon}
 "Penguin Overlords"){kind=icon}
 "Decision 2"){kind=icon}
 "Ether Cannon"){kind=icon}
 "Ether War"){kind=icon}
 "Mine of Sight"){kind=icon}
 "Pixoji"){kind=icon}
 "Frantic Frigates"){kind=icon}
 "Paladog"){kind=icon}
 "Bit Blast"){kind=icon}
 "Particles"){kind=icon}