Some juicy stuff from adversity1 in the 1.01 HS thread:
Big post by YOSK today.https://twitter.com/YOSKQ/status/490857206225444864
"With regards to my only standing world record Pink Sweets, for that score I dropped medals and I think if a scorer really tried hard they could beat it. However to a certain extent they'd need some info. This is the only game I know for which the timing of when you insert a coin is really important."
Next tweet 20 min later:https://twitter.com/YOSKQ/status/490862055470006272
"This is the timing for when you insert a coin. When the Harder Mode score rankings are on screen, insert a coin and start the game. For some reason the bullet count of certain enemies in the game will about double."
So I just tested this out, and holy crap, YOS.K was right. There's only one caveat, however: rank has to be at around 75% for it to be noticeable. As I was using Demul, I was saving states and playing with my regular route, and it only started to be noticeable once I got to the stage 3 boss where her large bombs on her last form ("BOMBA!") launched a ring of bullets when they detonate off the ground, and her sword bombs had twice the attack density. The stage 4 medal boats acted like they were on Harder Mode after you destroyed the main turret.
This is actually really interesting, and I'm wondering if at absolute max rank (which I would usually hit once I get to the stage 4 midboss), Harder Mode suicide bullets come into play. I haven't tested that far yet, but I can see how this could lead to a few million extra points when combined with the Rapid-A&B rank boosting trick to max rank as early as stage 2.