The beginning makes me visualize a character entering a new world for the first time and being astonished by the world's beauty. Then said character's friends join in on the fun!
I love the chord at :15. That's what establishes the intended mood of the piece :D
Your selection of instruments works well here. I love the melodic instrument, especially thanks to the lovely delay.
The transitional sound effects sound dry. I think they may actually a slight hindrance in this kind of song, in which you created a reverby atmosphere using primary instruments. Also, the sound effects with strong bass frequencies create a variance in the feeling that the mix transmits.