This is great! I absolutely love the themes you developed with the flute (which sounds gorgeous btw). The composition and the way each track flows into the other is spot on!
For the combat theme, I would suggest layering harmonies to add tension, I find it works really well to just change the pedal note even when keeping the same ostinato on the strings like you did here. And layering and adding new instruments that just play an octave up or harmonise with already present ones really helps bring up the tension and create movement. But it's sounds nice for a first attempt nonetheless. Keep up the good work! Great job overall!