Staff isn't doing much to this board, sadly. But I've got some time. I'm technically not staff anymore, so this isn't technically an ocr evaluation.
Around 1:40 you've got an interesting mixing situation. The bass is nice and clean, though it could probably stand to have a little more lows. The mids and highs are a bleeding mess. Use EQ to carve some space in the accompaniment so they don't compete with the leads. It's difficult to say which frequencies are best to carve in, but probably somewhere in thethe 1kHz-4kHz area. That should make the mix overall more clear.
I quite like the instrumentation, except the bass. It's a bit dry, a bit raw, it doesn't quite blend in. Maybe eq shaping, tweaking the filter or its envelope, something like that would help. Maybe giving it a touch more lows (carefully) and cutting some low mids Or using a different patch altogether. Maybe something silly like a filtered reverb on it would work, difficult to tell. Or it might sort itself out once the mixing in the mids and highs is done. In any case it's not a big deal, though still worth looking into.
The tuning difference isn't a big deal. It's gonna bother some people, be interesting to others, and others still aren't gonna notice it at all.
There are always things you can do to improve it, but I don't think it's cost-effective to make a lot of changes at this point. I think it's best to just try to correct the mixing, adjust levels slightly after that in case the leads are needlessly loud, maybe do something about the bass, and then sub it. It's pretty good already. And I don't think it's cost-effective to spend too much time on the same track (I know from experience).