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Influence

My suggestions (thumbs down from me until you update!):

1) The railings overlap in your elevator rooms, like in your others, which is unpleasant, as I've said before.
2) As @Aicxe said, the piston platforms are unnecessary.
3) The observation rooms are also unneccesary. The one in the exit isn't even entertaining.
4) The player can get trapped on top of the fan in your easter egg, thanks to a portalable surface on the ceiling.
5) The skyboxes need work. Try using the skybox texture (tools/toolsskybox) instead of a lighting texture. You'll need to work with the lighting if you want to preserve the warm lighting.
6) The PeTI music should be removed, and instead a soundscape should be used (try using one of the destruction soundscapes).

Going to do some updates soon. Probably later tonight. Thanks for all of your suggestions.

I guess those platforms are there to make a fling with the cube, so the cube lands in the funnel. Well, since there is portalable surface next to the funnel, it isn't neccessary, you just simply press the two buttons and put the cube in the funnel through portals.
Also, you should experiment more with the lights, since someplaces are black.

Suggestions:
1. Your railings in the elevator lobby clip. I dont know if this is intended, but I just wanted to point that out.
2. The piston platforms are not necessary, since you have portalable surfaces anyway.
3. One of the buttons is not oriented right. It would be nice if every button was facing in such a way that the player pushing it can see the laser in front.
4. The pedestal button at the bottom, by the not-so-deadly goo, looks awkwardly attached to the not-so-deadly goo. Maybe put a raised platform on it, PTI-style.
5. It took me a while to realize where the exit was. You need more lighting along that exit hallway.
6. Your skyboxes need more work. Also, there's just black where the floor should be in the broken floor tiles of the antechamber. Put some concrete texture on there.
7. LOL at that observation room that lights up when you exit.

Commendations:
1. Love your orange deadly goo in the elevator lobby. Love it.
2. When I was in the level , at first I was like, "OMG is that deadly goo?" A failed attempt to land the piston platform led me to realize its just water. Glorious water! I love the sound of my boots splashing on water. Seriously, I was frolicking on it before I actually got to testing.