A brilliant flash version of a great game
The only criticism I can make is that the flash version seems to be longer than the real thing ;p.
Other than that it was brilliant. Nice puzzles, great portal effects, a good range of challenges, a pretty good learning curve with only a few bumps. One thing I noticed was that one level had a glitch that made me fall through the wall and die, but I imagine the rest of it was really hard to programme and you seem to have got it just right. Physics were pretty darn good and graphically it does the job just right.