I will not critique this is as a song, but as a preview.
Build is exciting, and reminds me much of teh Popular game DooM. At 42 seconds in I hear this slight drumbeat, and its nice, just doesn't seem to fit the rest of the song. Add a little deeper bassline, maybe even some kind of epic electric beat, it just is missing the fundamental bass, which make this song hollow. I see you tried at 25seconds, but make it a bit Harder.