bugfixes

"It was working perfectly on my system"

Users reported problems happening right after the first scene ending, when using windows. Smug linux user I am, I never found the problem... but there it was. 

Latest build of the demo *should* work now for windows users. Some graphics and a bit of balance on the player movement were also added, though it's not that much of a difference from what the html version of the game offers.

Thanks to Garu and Bitman for helping figuring this bug out.