First off i feel like i recognize that Nexus Lead before the drop (Single layer Lead - LD Square Lead 1?) ;P
I feel like your chord progression presents a little simpler (but not simple by any means) than what you wrote.
I'm interpreting this; I - i - vii diminished - IV - ii - I in B
I'm also going off my ears. But it sounds like a modal borrowing progression. Still a pretty good one, the "vii" to IV is a bit uncomfortable, but it works with the lead.
That lead writing is SO good, well done there!
Now just like mutty says, the loudness of the saws REALLY overtakes the whole mix, those can be way more in the background and still create that dramatic feel you're going for. Love the plucky lead so much man.
Great transposition, I agree with mutty, it COULDVE been executed a little better, but its much more of just a straight transposition for dramatic effect. Take a look at my song Transcend, I use a chord progression in the second drop that transposes almost seamlessly, Using;
Key of F#maj
Imaj7 - vi - I13 6/4 - iii 6/4 - I/G# (Acting as the vii min7 of A major, the iii 6/4 also acts as a ii chord in A major, while still sharing the same notes in F#major, making it actually a ii - vii of A) Into A major; Isus2 - V7 - ii. Then it goes into some weird complicated stuff with a flat 6 and weird sus notes and 13ths in the NEWLY transposed A major which brings notes back from F# major and does weird things to the brain if you try and analyze it and weird stuff ahah.
Anyway, your transposition is good! but it reminds me of pop, where they just transpose into the new key suddenly, take for example living on a prayer by bon jovi. that last chorus they just instantly transpose to another key on the WHOA and its great, its dramatic and impactful.
Long story short I just wanted to expand on mutty's comment that it COULD'VE been executed better, by using chords like the ii in your original key to ACT as the vii in another key or the IV in one key to act as the V in another key, then transposing to the I or i in the new key. BUT, i don't think you NEEDED to make it smoother.
I digress, WHEW. Still with me?
Now, Over all really good, the rhythm on your leads in the drops are great, but again, the saws overpower everything for me. the transition into the transposition into g is great, take everything out then a nice swell into the drop again. The bass, the snare, the hats, all overpowered by your saw synths. everything is mixed pretty good except your drops, just so much going on.
overall great piece, and excuse me, I love nerding out about theory.
Overall Composition; 7.5
Overall Production; 6.25
Overall Impression; 7
Score; 6.9
Well done!