Summer Januaries work in progress-- Only Need The Stars rough mix

https://soundcloud.com/the-summer-januaries/only-need-the-stars-rough-10-11-2018/s-gf6tQ
 
Hello all,
 
Above is a rough mix of a new song, "Only Need the Stars". I would appreciate any and all feedback, most critically re: the arrangement and mix. Piano, guitar, and upright went down live in the same room, vocals and various other instruments and sounds are overdubs! Tracked to Sonar Producer through a Focusrite Scarlett 18i20 and various mics :)

 I know it's a rough mix but here's a couple of things that struck me. I'm more of a casual listener than a sound engineer and I listened through headphones. 
I wonder if you're in the right key since it seemed like some of the lower notes were out of the singer's range. 
Wasn't sure what was going on ~1:18. I thought it sounded like a fireworks rocket going up or something?
The instrument breaks at 1:46 and 3:06 just didn't sound right, as if the tempo was increased for 20 sec or so.
 
It's a really pretty tune and I do like it. There were just a couple of things that bothered me.