I am disappointed that it will not give me the achievement when i am 23 levels higher and it stays on 41. I have to go with my Hitchhiker instincts and stay alive until it awards me with this mere 15 points and a HHGttG reference.......
This might sound crazy but............... Toss the turtle 2. Way more upgrades! Unlockables such as cannons, guns, accessories, the thought is infinite. i know this isnt alot to go off of but yeah.... maybe some skins such as zombie, squirtle tmnt awesome turtle-awesome face turtle- etc.
 "IndestructoTank! AE"){kind=icon}
 "Boxhead: 2Play Rooms"){kind=icon}
 "Toss the Turtle"){kind=icon}