I'm really digging the build ups you've created. For an unmixed composition this is a really good start. In fact I think you wouldn't need to do much mixing in terms of dynamics. Sad to hear you couldn't finish it. Guess you learned the hard way to always have back-ups and keep it off your computer!! Haha.
Regardless, a very good arrangement!
If your interested, Check out a song I uploaded. Im into this genre and would appreciate feedback.
All the best!

Everything work out great. I love how it grows more intense and complex.