Update demo: adding pointers for the first levels

Hey!

Some people commented after playing the demo that it's hard to know what to do if you you are not familiar with the original game AlleyCat.

I am not a fan of big tutorials and hand holding but ok the game might need a bit clarification. I added some simple arrows just to point you in the right direction...

There will be more adjustments in the near future. 

Thanks for the comments. Every comment is good comment!