I am prepared for the liking of remix. Very good ambient intro.
The sound design is great. That string crescendo at 1:00 could have perhaps a little more reverb on it to give it more of a natural / extended sound perhaps. Personal taste. Sounds great. At 1:37 it feels like a build-up that peters out a little until the drums come in, not sure if you could put something else in there too. *shrug*
The drums lay down a sweet surf rock vibe. 2:20 brass seems a little louder than necessary but probably only by say, 3db or so.
Definitely a theremin-type sound. If you want to go full-on theremin, you could try BTS Super Theremin VST. But this is passable and acceptable as is, no issue.
The bass seems kind of stereo separated, or at least I'm hearing it wider than what my ears tell me is appropriate. It'd be great to hear it as a more centered bass to help hold down the foundation of the song. The drums may be a LITTLE quieter than they should be, but I'd be careful raising them too much. Other things like lowering the brass will go a long way, in addition to a small drum boost, to make the foundation stronger.
This is a really great mix. Some things could stand to be a little less dry, like the higher vibraphone type sound at 2:43. Strike a nice balance between popping in natural reverbs but don't overdo it! And again, lowering the brass a little might go a long way to helping out - instead of just putting a bunch of reverb on the brass, lower it a bit, and apply a subtle reverb. I think that'd work out quite swell.
I think this is pretty solid though, it sounds on par with stuff I've seen posted or to-be-posted, just a couple small tweaks. Nice work
Just as a side note, you probably already do this, but make sure the lows on your reverb sends cut off at 800hz or higher. This'll make sure your reverb is nice and subtle, and less muddy. Not saying the song has that issue, just saying in general.