I like that you have an identifiable musical theme throughout the OST. The next step is to incorporate variations of the theme: rhythmically, harmonically, scalar, fragmented, stretched out, shortened, etc. You'll get way more mileage out of a theme by changing it up.
In that vein, the first three tracks happened too quickly and they weren't differentiated enough in mood. "By The Campfire" is laid back (as it should be). "The Ambush" should punch and really break the safety set up in "By the Campfire." "The Fight" should then capitalize on the initial punch and thrash around - it's far too safe.
Keep practicing and keep at it.