I think this piece captures the forest theme really well! The tempo and overall 'weight' of the music felt spot on. I think one thing you could potentially try is varying the texture of the music a bit, the rhythms and melodic lines felt a bit too same-y towards the latter half of the piece. Maybe you could try things like sprinkling in little, faster melodies on instruments like the flute or oboe, kind of mimicking bird calls and such. You kind of do it in places like around 1:08, and it sounds great. I think you could do more of it, and bring those melodies a bit more to the front of the mix to make your music even more interesting and engaging for listeners. Great job though, this piece is already fantastic as a forest level BGM!