Another small update demo

Hey,

I made another small update. There were some soundfiles that were not converted to ma4 so I did all the files.

Why this change? Well, it could help with apple devices. I know from the past that a lot of problems were solves by changing sound file from mp3/wav into .m4a.

So for what it's worth, maybe this will make the firefox browers version and others beside chrome playable.

I did pixelate/reduce some other minor images too, so the total project is again reduces in size. Hopefully more people are able to play it.