Seems to depend more on luck toward the end of the scenario levels. Best bet is the second type of ball because its collisions are inelastic--also found the black singularity ball very helpful.
For my part, I find the spikes horrendously unfair; considering the speed at which the turtle moves at later stages there is no reason to include a steering mechanic in the game at all. Even if this were not the case, there have been times when the turtle has been above 1000ft (that is, out of sight) and has summarily run into something and died. What can the point of a steering mechanism be when faced with these nefarious and invisible devices?
To my mind, there is little point to having anything present in the air after one unlocks the golden cannon, unless there is some humorous value to take out of wasting one's time torturing a turtle so. This having been said, the game was not terribly un-enjoyable until I advanced to the golden cannon, and so I give it a perhaps over-generous 3/5.
 "Warp Game"){kind=icon}
 "The Gun Game 2"){kind=icon}
 "de Blob 2 Revolution"){kind=icon}
 "Topsy Turvy"){kind=icon}
 "Momentum Missile Mayhem 2"){kind=icon}
 "Toss the Turtle"){kind=icon}