Haters, shut up, this is a great game
Brilliant minds think alike. This isn't different with flash games.
I find it amazing and amusing that so many reviewers would go on whining about similarities between your game and Portal or GLaDOS.
The game is great. Great graphic work, very responsive controls, great ideas for levels, and the music, even repetitive, only gets boring after a long time. No doubt a great quality work and deserves a good score.
The only thing I didn't like: it's too short. You could make more levels. Also, if you even think about making a Invertion 2, try to put on new stuff - not that you need, just to shut the haters up.
I find it quite sad that so many players would lower your score based on the "theory" that you ripped off existing games. I say "sad" because you obviously put a lot of effort here and, even if you did get the idea from somewhere else, at the end of the day you just made a very fun and entertaining game with a great quality AND made it available to the world via NG.
Great game! Congratulations! You deserve a great score and a place on the front page!