This is good! It's a nice arrangement.
I would do more to the vocals from a postprocessing perspective, like the effect is good, but it doesn't feel layered into the song like the rest of it is stereo and the vocals sound mono. I think even with effects like this, you still want them to have reverb and stereo so that they feel lush regardless.
So, you could use something to stereoize the sound more clearly, or just take the manual approach and make a track with a delay between left and right ear and slightly different volumes and EQ. Sometimes this is more of an art than just trying to absolutely mimic physical space.
Heh. Usually I talk about people for trying to save something in postprocessing, this is the opposite sort of feedback! Ha.
Also thinking I feel like the effect could use a few more of those higher overtones, where there is that nice crunchy effect. I think this would sound amazing with some of these changes.