One Word!!
ADDICTIVE!! If you make it two VERY ADDICTIVE.. A new concept to Toss the turtle and such games. Thou it was really hard in the beggining of the game. If you give it time and earn upgrades it will be much easier.
TIP:The UPGRADES to get first is More time(Upper left), Faster kicks(Lower left) and above faster kicks which will give you more damage when you hit the case he uses as a shield.