^Definitely everything he said. Needs some low end, maybe even sub bass thing to fill up room because it just sounds "empty" right now. But when you add that in, the huge reverb will mess with the low, so either automate it or lower it down in general.
On top of that, I feel like it needs some counter melody. The chill feel you're going for is great, but the track needs some progression else it starts to become bland. I feel this has definite potential though, just needs some tweaking. Good job!