This game feels like Portal and Mirror's Edge, which is really cool! The game was a really interesting puzzle experience, and I'm happy that a lot of puzzle ideas were explored, it really looks like you are committed to continuing the game, which is cool! One of the ideas I really liked was the box puzzles, because of how it flowed. Instead of some 'pick up box put it down' puzzle, there was more puzzle in-between the box 'puzzle', which is always appreciated.
I do have a couple issues though. The first one is that the movement can be a bit funky, as when you jump, you really have to commit to it. Another one is that the game can be quite punishing when you mess up. I died close to the end of the last level, which stunk, as it took a while to get back to the point I was at. As well as that, The launching portal in the last level is janky, killing you if you go too high up. Lastly on the last level, the janky jump boost portal can cause you to not be able to continue on in the level without restarting. Last up is an issue with the player and interactions, where you can easily see clipping on the boxes and also the arms of the character.
Now, back to the positives! I enjoyed the unique effects with the portals. It was really cool, definitely liked that! The easter eggs were also fun, I noticed the one in the last level :)
Overall, this game is a fun puzzle experience, with cool, unique mechanics, and cool visuals, but has some difficulties with movement and certain functions. Nice work, I hope that this feedback helps with your future ideas :)