We prefered to use the arrows because there are common on every keyboard instead of the qwerty configuration.
And thanks for your advice with the start button. I agree that it should be a good idea ^^
Because you can't go through some part of the run without the proper form : Giraffe for water area, mouse for holes, marabout for pits on the ground. And for the ingredients too. You can't have any banana without taking the giraffe for exemple