@Marcousik
Sorry that I was late for two weeks with my answer, I was busy developing the game.
About the jump at the end: demo should end with with player dying, since I haven't completed this scene at that moment. We'll fix this in a huge patch.
Also, about all the other problems that you discovered: we have already fixed them in current dev build. Huge patch will be released in a few days. But about fullscreen: it's still problem for many players, because this is an engine bug. We are considering some ways to fix this, but unfortunately not have positive results for now.
When we finish developing in about six months, we're gonna release BETTR in Steam. We'll open all the source codes so that people can make mods on our game. There will also be a separate project called "Project G.L.U.E." (Global Leadwerks Universal Extention) - this will be a commersial version of our set of Leadwerks improvements, which will require pre-purchased Luawerks. Project G.L.U.E. will cost only two dollars, I think.
Thanks for your feedback!