Oh my fucking god dude, checkpoints please. I know the first and second part of the level better than my house at this point. If no checkpoint, at least don't make the character one-shot.
Theme is a bit far-fetch for this mechanic.
Other than that, I would say the puzzles are solid enough. Although I can't really say for the latter ones because I give up after the robot happens to turn around as I walked out of the shadow and just one shotted my chernobyl sonic, but the early levels are good enough, and the in game tutorials are decently made. What is slightly confusing is how the portal actually works? Not how to spawn them, but how to jump into one. I ended up pressing spacebar and that does it sometimes, but there was a portal that was slightly higher up (I think it's in section 3 of the map) that didn't worked for the first 20 times I jump around it, and after some box-pushing because I thought it was that kind of puzzle I just sort of walked around it and got through, very confusing.
Thanks for the game.