A small update:
I've worked on quite some stuff, mostly on levels and enemies but I will only show the skate level for now. I don't know if I ever posted the old one but I did not like the movement/ handling and the code so I've rewritten it from scratch and recorded a short video of it, check it out here:
http://www.youtube.com/watch?v=JR1jqE11R-wIt's not the most beautiful level but I won't change it much anymore (except the color and the shadows) because I've already invested so much time on it.
EDIT: Btw. there is a problem (probably a bug) with the normals that is sometimes visible on the skateboard and the reason for wrong lighting.