Press the space bar when the red square is in the centre square to get points. The game gradually gets harder and harder
Objective: make the centre square really small
Idea/code inspiration from: https://developer.mozilla.org/en-US/docs/Games/Tutorials/2D_Breakout_game_pure_JavaScript
and: https://itunes.apple.com/ca/app/stack/id1080487957?mt=8