Nothing exciting.
I'm not particularly thrilled about this song. The piano voice you used sounds very generic, which is fine if you're only concerned about making a really catchy melody. The problem is, the tune sounds very unexciting and generic. And it definitely doesn't sound like it would be a battle theme. Overall, the song makes almost no impression on me. If I were to suggest an improvement, it would be to come up with some distinct tune which can hold its own for 2 minutes. Failing that, you could just use more instruments.