Some nasty encoding you've got there. I'm sure you could improve on that, greatly.
The camera work is nice, but since it is an "action-camera" you could make use of some actual action, combat and such. The empty spaces clashes with the spastic camera. It's seems to me that the camera is searching something, it's rather unsatisfying when it doesn't find it in the end. That's the other thing, it's spastic the whole time, for compositional reasons you could include other kinds of shots. The spastic camera works great with still shots, slow "out-zooms" and close-ups. The graphic design is fine, other than that SOURCE you slapped on, you could get rid of that.
The reason that I'm so critical, is because I see potential, if I didn't, I wouldn't bother. Always remember DRAMATURGY, even if it's just 30 seconds of trailer. When it's this kind of action trailer, it's all about craftsmanship. Perfect cuts, perfect composition, perfect transitions, perfect tempo. If you throw an idea in there, such as a joke or a thought, that could outweigh the potential weaker visual elements of the trailer.