Puzzles are good, physics feels like it has some issues.

(If I'm understanding this right, if there's a ledge that's shallow enough for you to walk up/down, then the game lets you move perpendicular to the ledge but not along it, one consequence of which is that you can't go up stairs if you're not centered, since the side of the stairs is a ledge.  For the case of trying to go up the side of stairs, maybe automatically moving the player completely onto the stairs would work better.  But also I notice the yellow blocks move on a grid, so I wonder how it would feel if the player also moved on a grid.)

Really fun idea but the character controller  was a bit fustrating, It feels a bit like Mario 64 with turning around and the fact that you can't fall down ledges made  it fustrating going down the stairs again and again. Also I would maybe consider adding a sprint button.

Besides the character controller, the level design and execution were well done. 

With some polish and a rewritten Character controller I think this game could really shine! 

Really fun puzzles. The portals worked really well. Really smooth. I like that the boxes were essentially used to create missing parts of the level. I could definitely see this idea taken further.

The stairs were frustrating to climb at times. I had to wiggle a bunch to climb them (the level with the gray boxes above the movable moxes)

Game is quite good, graphics need little work and i lack any sound or music, also some puzzles feel like a chor where you know the solution, but you need to work for it for like 3 minutes of box pushing. Other than that good game. :)

This is a great idea. I really enjoyed the aha moment when I figured out I can push the blocks through the portals! 

This is a great base for a full retail release puzzle game!

Very polished with great level design, I played it all the way through!! cool concept and I love the Portal inspiration :)

Exceptional concept, great design and very VERY well optimized to run on the web. Great work and i would LOVE to see this expanded in the future. 
Hate to point out a flaw but the stairs in some levels are slightly buggy