Nice little game! I didn't understand the "redirect bullet" mechanics at first: maybe a little animation (like the little line when you die) when a bullet teleport between portals could have made this more clear. Or maybe I'm just dumb, after all, I finally understood xD. I liked the concept and enjoyed the little puzzles!
The controls were a bit strange: having one key to grab and another key to release is really odd, I guess that's why many people think the controls are broken. I naturally tried to drop crates with the same key I used to pickup. And the "E" key is displayed in game, but the "Q" never is, you have to go to a menu
The movement is quite good, but the character has a little bit too much momentum: when I release my direction, the character continues to move enough to screw me ^^'. Keeping a bit of momentum is nice, don't get me wrong, but I would reduce it. The character also slides on the edges, which is a bit frustrating. The combination of this slide and the momentum make the general movement sometimes a bit janky. You're close to really nice controls, just these two little tweaks to make =).
The level design is nice, I liked how you showed the different possibilities the gameplay offered: puzzles, platforming, combat, a little "shield" sequence... That was really cool, and the checkpoints were appreciated =).
The little custscene is a really nice touch! The music is really nice, and I enjoyed the graphics, so good job on that =).
I reached what seemed to be the end, but... Is it bugged? A cutscene of me liberating my friend played, but my character slipped off the edge and died to lasers... Then, when I finally managed to time the cutscene to be played when the lasers were off, it just ended with a black screen... The description says "Once you replay the game however, you play as the person you rescued", but that didn't happen for me. Am I missing something? Unfortunally, in that state, it is off-theme ^^'.
Overall, that's a very nice concept, with a nice implementation with just a few nitpicks, a banger music and nice visuals =). Great job!