Oh, I love this. I like the transition from a very calm and happy atmosphere in the beginning to a bit more creepy and haunting atmosphere, while ending in a harmonic - almost dreamlike- relaxing atmosphere.
I could imagine this as music to a movie trailer or as the music of the title screen of a psycho-thriller/ horror game.
Only thing I did not like was the overuse of the electric guitar in the middle part and that the eguitar had too much reverb.
Other than that it is a really well constructed piece of music that I really enjoyed.
Good job, keep it up :)