Pushing apples

The purpose of this project is to introduce OOP in High School. The apple can be moved by pushing it forward or pulling (rather dragging like a magnetic mode) it backwards (press p). The apples have to be inserted in special walls. If all apples of a level are successfully inserted a blue piece will arise as a trap door to a new level. In a future version the shortest distance of the player to this blue floor piece will be calculated (Dijkstra). In the last level it is possible, that a special apple-wall is not accessible. Therefore the player can use a bomb (press b and run) to delete normal walls. But beware - the player himself can be deleted as well.
The player can use as many bombs as there are white lines painted on its image.