And please rethink the achievements, this game is capable of so much more, but not when you can accomplish kongs achievements in 5 minutes. Put a hard on there, all in game achievements in one game.
Sorry, but unless hes updated and fixed a bug i didnt know about, cannons work fine. They always have the same trajectory which is exactly where it needs to be...thats part of the puzzle. Their is no glitches, or malfunctions with the cannons that i saw.
 "Upgrade Complete 2")
 "Great Game 1/5")
 "Wake the Royalty")
 "Civilizations Wars")
 "Enigmata 2: Genu's Revenge")
 "Bloons Super Monkey")
 "Frontier")
 "me and the key")
 "StormWinds 1.5")
 "Civiballs")
 "Tilt")
 "Don't Look Back")
 "Dinowaurs")
 "Hedgehog Launch")