Sounds really pretty! Definitely gives me night time/moon atmosphere, as well as an explorative, happy but also dark mood. The instruments work super well together (the smooth but bright bell, the saw leads, the airy leads, the bass you chose, etc.) and they all come in at the right time. In terms of mastering since that's what you said you're working on, I think it's also pretty good! Nothing sounds intrusive, and since you give certain instruments "turns", they all get to shine individually regardless of the master I think. But either way great work, keep it up!!