This one's huge... A little rough around the edges, but very playable... worth a look!
A 17-level scenario (or a little more, if you count repeated levels), with modified shapes and art. (The shape mods are mostly a new weapon, but there are a bunch of small things that add up to a more complete experience... check out the doors, for instance.) It could use a little texture alignment, but overall quality is quite good. (The first level is very slow-don't judge the entire scenario by it.) Nice AI evolution.