Hmm I haven't played all of your games yet (played the flower one and the fruit bowl one) but this might be the best one so far. I like how you actually gave the guy a cart as opposed to him being stationary in the old flash game. Gems are really really hard to catch though. And I feel like the claw is a bit randomish. Is there any method to the way it determines it's speed or is it just based on a rand float? Slow ---> fast later on might be good. Overall very well implemented though. I just wish the claw was wider to compensate for my bad aiming skills.
Claw rotation speed depends on the level, but it is a % thing:
hookAngularSpeed = 2*(1+level%3);
while claw pull speed depends on the weight of the thing you are pulling.