Simply it's Portal in a different custom, except it needs more platforming skills. Also it's a bit boring.
The game has some potential but is not nearly as good as portal. The idea is the same as portal's except that it has 4 dimensions instead of portal holes. The puzzles are straight forward, except few offered a bit of challenge. The professor jokes were a bit lame beside his tone of voice which made me want to sleep (no offense). Also, what disappointed me in this game is that I've spent most of the time taking lessons than solving puzzles. Finally is the ending of this game which extremely lacks creativity.
What I liked about this game is the level design (i don't mean the puzzles, just the architecture). The pictures on the walls looked funny specially how they change when you shift dimensions. The cat-like mascot is really cute. Also the slow motion dimension which was the best of all.
In brief, the game isn't so bad ,if you like puzzles and jumping, and worth your money for the new experience. Even though It's a bit empty and lacks ideas. But If you expect a good story , you'll be disappointed. I hope my review was helpful enough.