I like to think that long intros can make or break a piece. I've listened to a lot of Mike Oldfield to the point that I think a long intro with sufficient buildup could be powerful. That being said, as much as I liked what you did in your intro, it felt weaker and more underdeveloped compared to the power of the rest of your piece. A crash course in Mike Oldfield's Tubular Bells might serve as a good start, and I mean it.
When the rest of the instrumental kicks in at 3:00~, it's powerful. I love your drums. Cymbals feel too short in reverb / decay, so they sound fake. A solid bassline to ground the piece together would be much appreciated here as well. But I love everything you've done here otherwise -- the dissonance is on point, the piano is on point, and I could seriously see it as trailer music.
Those last few notes on the piano came abruptly, I didn't even realise that the piece hadn't ended by that point.