I think its cheap how a group of little drones always seem to come along while you are on a mission, then they knock your power out and kill you with crappy little guns.
I found this glitch hilarious because no game is designed especially for a mac: Use one of the specail mac mice with only one button and click while playing (you won't lose :) then drag the mouse while clicking straight up through and out of the game the note will leave the screen. use this for all of the red cannon levels including the walls and for the yellow cannon. Note go back into the screen and use a square pattern for the green levels. hope this helps
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