Sounds epic, but I feel a bit of "disconnection" around 0:25 and also ten seconds later (but less). Is this a work in progress? Why did you limit yourself to one minute, just out of curiosity? In my humble opinion there's not much you can satisfyingly develop in a single minute for orchestra, and with such instrument power why would you do that?
Regarding of how the orchestration was itself I am no expert nor really experienced enough to give you advice. I am reading "The study of Orchestration" by S. Adler so perhaps I'll have more constructive feedback in a year or so, lol.
The melody flows perhaps good enough, but I don't see where does it want to go, it seems to be going but without knowing where. which is not necessarily a bad thing, just pointing out my feel.
Kind regards!