What's nice is
From just the beginning, I was entranced by the piano riff against the arctic winds (in fact, I'd almost prefer that emptier section to linger on a bit longer so that I could've savored it a bit more). But the pads were nice too - really like their organic, flowing nature. The drums were subtle to taste, though it sounds like to me they are the main source of the crackling? Overall, this all coalesces into quite an exquisite sounding piece, though certainly I wish were a bit longer (or just drawn out a bit more).
I took a brief look at the waveform, and it looks like the crackles come where there are flat peaks. I'm guess this is probably due to "soft-clipping," so may trying lowering your levels (especially the drums) some more so that nothing clips at internally. Or maybe you applied a limiter or some sort that cut off some peaks? I donno, but yeah, that's my guess about the crackling anyway.
Anyways, great job on this! I'll be looking forward to stuff from you in the future!