This sounds good, but it could use some work. I like the sound of it, but a lot can be mixed/added into it with instruments and beats.
Simplicity is good, but I feel like this could be the backbone of something much larger. It's always nice to hear what two people can create though, and good considering two people worked on this. Straight melodies that you have running throughout needs a bit more life from a drum or a soft guitar string.
Given that you probably won't add this anymore, it's a good stand-alone but can be worked upon to be something amazing.
Good job!
o
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