The plot in general reminds me a lot of Cube. The constant voice of GLaDOS also brings back fond memories of Shodan from System Shock, though she wasn't funny. I also read it's like the Island, so I added it to my Netflix queue.
The boss fight and ending credits really made everything worthwhile. Possibly the best ending I've ever seen, though games rarely have particularly memorable endings. I especially love the ending theme - Still Alive (no wonder- it's by Jonathan Coulton):
This was a triumph I'm making a note here HUGE SUCCESS! It's hard to overstate my satisfaction. Aperture Science We do what we must Because we can For the good of all of us Except the ones who are dead But there's no sense crying over every mistake You just keep on trying 'til you run out of cake And the science gets done And you make a neat gun For the people who are still alive
Now that I get it, I've got to make a papercraft Weighted Companion Cube. As someone in the Gamefaqs forum said:
I'm going to make one.I would never incinerate mine, though.
Then I'm going to incinerate it.
It'll be just like old times!