Great job with your game. I enjoyed it. Very good use of theme and very clever puzzles. I like how you put in the story and tutorials on the Itch.io page.
The controls were a little finicky, which I was able to handle until the anti-matter people were involved. My criticism is that it became frustrating to work so far into the puzzle to die trying to navigate around their attack/view fields.
The other issue I had was similar in that I got far in a puzzle and dodged the anti-matter people a number of times, but I accidentally teleported a cube where the other self could not access and teleport back.
Overall, just game design issues I don't have an answer for. Maybe that was your intent. Whatever the case, it is a very fun game. Keep up the good work.