Yep, that kind of things often happens if you let yourself drown into the sounds & music, which is indeed difficult to avoid, sometimes it's more easy to start with minimal elements to get a foundation instead of dealing with rich & very melodic content right from the start.
Well at least you ended up with a nice slow motion & cool track. Its not empty and cold, just missing some more variation in the arrangement & beat IMO, also I was very surprised by the kind of "dissonant" ending.
For the levels on Soundcloud, you should get the mix a tiny bit down before uploading and you'll be good, this one is peaking in the red when passing through Mastering The Mix Expose. You can ignore the phase issue report, that was not even for a second of audio