Press SPACE to start: The red square follows your mouse pointer. There is another red square in the backdrop that is their to confuse you. The green squares in the sky aren't sprites either and are there to confuse. The REAL green square will move around, blending in with the grass and sometimes going into the sky. Try to touch the REAL green square in the least time, and press SPACE to start.
I thought of this game myself. Any relation to any other game is purely coincidental.