For just the mere vision that you had in coming up with this piece, you deserve my respect.

Now I can imagine an epic battle song with this melody-- all this needs is an orchestration. Keep this melody, consider this a work in progress, come up with chords that fit it, and remember to build up and have a climax and resolution. Adding strings (marcato or pizzicato) could transform this piece altogether. Alternatively, why not make it a piano-only battle song? Fast piano accompaniment? The possibilities are many, and I like this starting idea that you have because of how far you can actually take it.

The piano by itself is insufficient, I find, because this seems to be playable by one hand for the most part. It seems like only the right hand is working its magic on the keys, but what about the left?

Please, do complete this thing. I would love to hear the final result! :D

Cheers!