I'm curious, why did you name this piece Oasis?
When I think of an oasis, I think of a rest stop, either by the interstate or in the desert. Though your thumbnail works with the title, there's nothing about this piece that, IMO, makes me think of an oasis.
I'd also like to hear what your thought process was, as it will help me provide better feedback and a more accurate rating. I'd be able to judge based on how well your intent came through rather than simply how much I liked your piece.
Mixing-wise, I think you should use some compression/limiting plugins, or at least some normalization, because IMO the piece is a little too quiet.
More info about how I review music here: https://codefreq.newgrounds.com/news/post/1089806