Very good.  Levels are very well designed, aesthetics look good, and the game is very responsivse.  I do think the levels require a bit too much precise gameplay, but for a jam game that's nothing to be too harsh about.

Nice concept! The level design was pretty good, required a little bit of thinking and aiming.

Some criticisms:

The physics (collisions) were a little bit odd, though, and it was very weird for me that I couldn't jump.

Ability to know which portals were connected with each other would've been appreciated, though it wasn't that big a deal with these short levels.

The title screen only showed up after I beat the game. Music in the levels would've been nice.

Great Concept!, but the game needs some improvements just to be more exciting, 

but overall the main concept and mechanics is very good.

Great Job!

Keep it up, rated!

if would be great if you can rate our game too :) 

https://itch.io/jam/brackeys-3/rate/574177

Enjoy :)

I liked the concept, a bit of work in the graphics, some polishing and include more sound effects then it could be a decent game. What also could work is a bit of camera shake when bouncing to the platforms.