I vote for "MutaBean"
Train Training: (my boring trains)
No sounds. No gameplay. No real logic (trains run over each other). No real game idea at all. So I guess this is no real competitor against the others. But you wait and see. Before you know it I will include 99 levels, lots of monotonous railway songs as a soundtrack and thousand of little whistles and bells. Even my very limited graphic talents can be hidden under waves of silly tricks. And then I will have the last laugh

Bwa har har!
Kitty Cat: (the fast and the furious)
The most artistic effort I guess. Comic style animation at its best. The cat is just so funny. Maverick, you are an animation genious. Amazing what has been finished in such a short time (as far as I understood, it was less than 2 days). Looking forward for more complete versions of this.
Glade: (the experimental light expert)
I am impressed with the sun, the light and the idea to begin with. Not sure if this ever will become a fast paced fun game. But even this demo is nice to watch endlessly. The most original idea. Here I would definately like to look at the sources to learn something.
Alien Inspection: (most finished fun game of all)
This is the most developed project. Great job! Even sounds included. And a real gameplay. And as far as I can see, the technical aspects are impressive: mouse handling and moving of objects, shrinking, collision control. The graphics could be improved, I guess. Maybe some more animations or effects. But still, this is a nice one.
MutaBean: (my favorite one)
This is my favorite project. The graphics are impressive. And even the gameplay is included. And it's even funnier not to play but just watch the great animation sequences. This is real 3D, right? I am old and hate to admit it, but this modern technologies really seem to be working

I thought about this for quite a while, if I vote for this or alien inspection. But I guess the slightly better looks let me pick this bean guy.