Finally beat 2-5. Jesus fuck that level was a bitch. It's an uphill battle so every enemy in front of you has the high-ground and cover making it nearly impossible to kill them, you get knocked into overheat in 3 or 4 regular bullets, or 1 bullet from the golden robot, your ARS lasts like 3 seconds, giving you enough time to kill one enemy each time you activate it, and enemies spawn constantly. Shit was a god damn nightmare but I finally did it.
I've got a feeling that's going to be the hardest section of the game. Or at least I hope it is, for the sake of my blood pressure.
PS. Don't replay an older mission if you're in the middle of a campaign run. It'll basically erase your progress for your current playthrough and screw over your total score. Found that out the hard way, so I restarted my God Hard playthrough. Normally I'd be pretty pissed about this, but since this game is non-stop fun, I don't really give a shit. Made it back up to 1-7, been blowing through all of the missions and improving all of my scores.
The best part is there is still plenty of room for improvement, since I haven't hit the +5000 bonus point time on any of these missions yet. Got +1000 and +2000 here and there, but still haven't maxed it out.

Mikami making the best TPSs two generations in a row.