You can no longer walk past the red shit that's past the broken aquarium, it vores the MC. I think you need to kill the red bulb, but I couldn't manage it and I'm not willing to try further because it's a shit fight. Maybe there's something special you need to do? There's a scientist you can talk to if you go to the door on the far right of the room that the red tentacle shit is in, don't read JAP so I've got no clue what he says.
To kill the red bulb, you have to wait until its eye opens up, then shoot the eye. The eye opening up happens right before the poison spit attack, but it's possible to get a bullet in and dodge by running, avoiding damage while getting your own hit in. Remember to use the Drink (second item) in order to maintain your Stamina. That stat helps you aim.
Anyways: Are there any other scenes that cannot be accessed via the Extra > Room 2 galley? I'd really love to know. Here's my list of 'non-gallery' Game Overs, please help complete it...
1. Big Boy can hug you to death.
2. After opening the door to the heliport, the giant flies are there.
3. Slicers spawn after accessing the heliport area. They have a ryona grapple and ryona hug/succ game over. There's no difference between the purple one and black one in terms of animations.
4. The aquarium area's red bulb shit. The wall is one vore scene. The bulb fight itself has another vore scene, if you try to run underneath it.
5. Apparently there's a giant slug that's confirmed to be ingame; I haven't seen the guy yet though.
Looking in the files, there are actually two different slug enemies; one seems to be the vore slug, and the other seems to have a simple animation of succing milk out of the MC's tits? There's also a jellyfish enemy that should have a constriction scene. Also, a scene of the MC bound by slime. If any of those are unimplemented, I wouldn't be surprised.
One more thing: There's a desk with a computer and mouse in the second building with a corpse nearby. Interacting with the corpse gives you the usual dialogue. You can also interact with the desk and it will spout something about an ID! There's only one tile where you can interact with it, so just wiggle around 'til you get the ID message. Does that spot do something if you find an ID?