Hi @Some Guy That writes Music!
I like this very much, just like you said it doesn't sound very complex, but because of that it sounds really peaceful to listen to. Love your imitations between instruments and that Lydian Bb. Even though the opening theme recurs it doesn't sound monotomous at all given how you modulate; I love your modulation to Eb major in b.25 very much. The counterpoint there sounds really nice. And of course a very nice retransition back to C major. This music almost reminds me of some very simple yet deep film/anime music, unlike those shallow film trailer music with bombarding brass and a loud climax at the end.
I hope I could have doodled something this high quality like you did haha! Thx for sharing!
Henry