The puzzles are super challenging, but very fun to solve. I really like the rift mechanic, because it's very unique, and you use it very creatively in your puzzles. The graphics look very nice, and the levels are well-designed.
I actually think you put in slightly too many controls in this game. In particular, the grabbing mechanic felt very unnecessary to me, as the game would have stood fine without it. Maybe it's just personal preference, but I think puzzle games shine best when you focus on a single mechanic, such as the rift, then build your levels around that. The grabbing felt like it was overcomplicating the gameplay. I also would've preferred jump on W and push/pull on space. Moving my index finger between the D and E keys feels very awkward, since it causes the player to stop whenever they want to grab a box.
Overall, excellent game with some great puzzles. I managed to solve all of them except the last one.