I played through a bit, I def did not get to the true beach, but...
I got through the backwards underhalls, and never was able to equip the smooth fists... So IDK...
I did notice that the mirror enemies are all "non furries, I mean, because they are completely different enemies from the normal ones.
Also, you can't pick up the super shotgun in the backwards underhalls.
So, that sucks!
I don't really want to play through myhouse again at this moment, so...
I will just tell you... stuff for sure broke! Lol.
Sorry I wasn't of more help.