A very clam music for an ambient. The beginning is slow and progressive and the melody is quite easy to get used to. The piano at 0:40 is really nice but it is quite dissonant with the starting background imo. You then seem to add several melodies and instruments, but none of them are as good as the piano one and the piano melody is too loud to hear the other melodies. Also, some of the melodies don't make a good sound pattern, they give the impression you just added as much stuff as you could, you have some care.
The end is calm and expected, all instruments exit nicely. It is one of the best endings from a new artist that I've seen around here. One thing though: isn't ambient music supposed to be looping? It kinda break the ambient if you notice the start and the end of the ambient music right? I am not sure so I won't add this into my consideration vote.
It is, overall, not a bad piece of work. I strongly encourage you and your friend to create and share more music with this community, some games and videos can really make use of pieces like this.
Keep your heads up!
Score, provided this is for ambient purposes only: