A bit glitchy and difficult, but still fun.
A glitch happened were a portal pointed backwards on a wall so i was able to move to the other side of the wall... off the course and through the start again. lol
FUCK FUCK FUCKY FUCK FUCK
I EFFING LIKE IT BUT IT IS SO FUCKING FRUSTRATING AAAAAAAH
Jum. I got the cake :D
In every level there's a bug which sends you trough walls if you fall on the edge of a wall trough a portal... And I really hated the facts that my cursor froze in game every few seconds, and at some points the turrets & yellow ball-thingies kill you anyway, like you go under the ball and it warps back & kills you, although it hasn't bounced off a wall yet, and the turrets, after the warning shots, even if facing down, they keep shooting, that's all the annoying bugs I could find... Otherwise it's a really good game.
You know, I actually enjoyed this game more than Portal itself. Really great game. Keep it up!