This is very impressive. The level polishing is some of the best I've seen, map06 and map14 and map29 are masterpieces, and the addition of the skulltag runes and powerups added some great gameplay elements. I must say that all the boss fights are unique and well put together, though the last level (while epic and fun), is very chaotic and some people may just be annoyed with it.
All the ambient sounds were great, though they were a bit excessively stacked in some areas. The music is also good and so is the story.
Mentioning the story, all the detail and work put into the .rtf file is very well done and I think more wadders should do this kind of thing (but it could have done without all the images and pictures, considering the rtf is about 17 mbs).
Overall it's a fantastic wad, and definitely not bad for your first. I look forward to seeing more.