Really dug the vibe in this song! That spacey room reverb in the beginning is actually something I've tried to replicate a few times but haven't found out how to do, usually out of lack of effort lol. The whole vibe in this song reminds me of some of my earlier work. I actually really enjoyed the build up until about 1:30 where it kind of plateaued in my opinion. If i were you i would of done away with the arp earlier or possibly layer it or layer the piano, I think that would of improved the mix a little bit. Another thing is that both the kick and bass didn't seem very bassy or powerful, something that I suggest you take a second look at.
I'm a huge fan of the slowed down part you have at around 2:20. I wish you would of kept the song going with that by adding a more down-tempo beat to it instead of using the same drums. I use the half time drum technique to make a lot of my sections seem slower, you should try looking into it!
Overall I think you have some excellent elements in your music and I do see a lot of potential, just try to work a bit more on your structure while Ideally keeping a good amount of variety in your songs to help progress it better. Keep it up man! :)