I'm not much of a trance person, but something I noticed was that after 0:26, there isn't a ton of melody going on. There could have been some textural shifts to add interest, such as removing the bass and having a tremolo pad with an evolving filter, or something as simple as an LFO on the filter resonance. Something else that could have been done is having a climax where you do use the melody again from the first 26 seconds. Hope that helps!