This game is incredibly polished, it looks like a part of a full game that it's story and visuals are up to the standards of a steam release
As for the puzzles though, in some I managed to get stuck, for example in the third room pushing the box through the laser makes the puzzle impossible to solve, same with the fifth room with the jump pads
To fix the issue, I think that a simple restart button would do the trick, it'll simply respawn you from the last checkpoint
All in all, amazing game, really enjoyed it!