Follow the square

I want a very basic game created
The square will move around the screen bouncing off the edges
the square will randomly change to one of a range of colours
Immediately the colour changes to BLUE the player has to quickly press the space bar to gain points. Too slow and they lose points and hear a horrid sound.

There is a bit more to it than that but I wanted to give you the basis concept

Please mention Elvis to show you have read this far and it is not a spam proposal.

I have not set a price.