Thank you for your kind words All of your advices are right. I'll realize most of them in next demo. About spikes, I think you can't see them, because your monitor is wide-screen I get the same error on my friends laptop. By the way guys, my best time was 4.04.656
2:06:801 that was my best time althoe i only played twice. its fun. i think extra lives and maybe other platforms would make it more interesting. such as a platform that breaks apart when you land on it so you are forced to make a quick decision.