Really awesome start on the atmosphere/mood.
I think the mix sounds a little compressed and not like it's occupying space. There are methods of doing this that aren't expensive or super difficult, but it can be a bit tricky. Main rules:
Near = drier, more delay on the reverb, far=wetter, less delay on the reverb.
Then mix with panning, L/R. I actually used DearVR Micro since it's a free plugin to place things in space for mine, which I really like for that added realism.