just finished the game. difficulty about medium. not my type of game (don't like puzzles) but very innovative. 5/5. i said b4 but it needs a restart button when stuck or for just quick restart.
not that hard. just upgrade tough, speed, and tackle. even though it shows 5 star max, keep upgrading and i think it still increases those stats. just simply grab the ball and zigzag to the goal. don't even have to shoot.