First hotfix for the demo

Firstly thank you all of you who tried out the demo so far, and special thanks for those with all the constructive feedbacks!

I updated the demo with 2 small adjustments:

• The bots are finetuned a bit, so they won't kick out at the start. They behave according to their difficulty.
• Added a basic settings to change the keys, it's minimal, not perfect, but it works.

Enjoy! ;)