I love that instrument - what is it, a low Marimba I believe? Feels very wooden and forest-like. The song is simple and repetitive, but feels very happy too :). A bit of variation in chord progressions, instrumentation, rhythm or anything would likely boost your song to a new level already. And you could try making a proper ending to your songs, e.g. by fading it out or looping it back to the start (which currently doesn't work because your start has a second of silence). Nice work :)