Shape recognition is a real issue...you may as well just scribble randomly since there's no telling what you will actually get from it. Momentum needs to be adjusted as well - when an object slides/rolls down a slope and strikes another object it shouldn't just stop.
Too unforgiving on some of the logos: doesn't accept Daimler-Chrysler for the Chrysler logo, Izod and Lacoste are the same logo so either should be accepted, etc...
Really needs to accept multiple correct answers on things instead of just the most common name. Also very frustrating to have to fumble for spelling names correctly when you know who it actually is.
 "Understanding Games: Episode 1"){kind=tracking}
 "Boxhead: The Zombie Wars"){kind=icon}
 "Holons"){kind=icon}
 "Sketch-It"){kind=icon}
 "Logo Finder III"){kind=icon}
 "Mysteriez!"){kind=icon}
 "Who Is This?"){kind=icon}