Almost perfect
I see you went for a somewhat soothing feel with this. You did pretty well.
There's not much I have to complain about, but there are some big issues.
First off, it's a bit too loud. Ambient songs should not be in-your-face, they should be in the back of your head, calming you down (or freaking you out, whichever feeling you want to bring out). And by loud I don't only mean I had my speakers on too high, but the sounds you've used should be a bit toned down.
The second issue is that towards the end, it seems a bit cluttered and too energetic. Again, considering you went for the soothing feel of a seashore, it should be rather relaxed. Try not to use the synthetic sound you've used to create sort of a rhythm, but use something else. Samples of bongos, or something like that. And just tone it down. Focus on making it relaxing.
Seeing as it's a WiP I won't criticize on the ending, though it ends abruptly.
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