I just picked up Q.U.B.E. To point out the obvious first, yes it looks a lot like Portal. It also feels a lot like portal. First person platforming, puzzle solving, white environment aesthetics. The character you play as never speaks and you don't really know why you are where you are. It's basically Portal without the portals. However, that's not a bad thing. The puzzles deal with you manipulating the environment to advance to the area. The manipulation involves rolling a color coded ball to its designated location. Easier said than done. You have to raise and lower blocks, push and pull blocks, rotate walls. Pretty fun indie game that should be checked out. Link at the top.