I found the puzzles lacking, actually.
Only a couple of them took longer than a couple glances to figure out what to do. The doing did take the most effort, but that's to be expected.
It was a great game, though.
I'd like to see more momentum based puzzles. I'm hoping the community maps take off soon. I've only seen a couple of user maps so far and they all suck. It won't be long before they get better, though. [/hope]
I'm loving TF2, though.
TF2PortalHL2:EP2I missed 11 grubs.

The Gordon Propelled Rocket was cool, but kind of a misnomer, I think. Maybe Grenade Propelled Gordon
I have to work more at killing a hunter with its flechettes. I tried just a couple times, but it didn't appear that I could pick them up with the Zero Point Energy Manipulator. *shrug*