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Thanks! Yeah I could see how it could be confusing if you hadn't played the tutorial. And I definitely need sound. 

The sound could be something simple. I think something in the lines of the old Atari 2600 games would fit with your graphics ^^

Try finding a synthesizer or something. I think you could use something like LMMS, which is open source, or Brfx, which produces something more along the NES era :)

If you need help with it, just give me a shout ^^