I liked the atmosphere and puzzle design, especially lasers going into the boxes the internals of which you can rearrange. And having multiple entrances/exits - that was kind of a “oh, I get it” moment for me, took a while to realise that.
Good to have the undo mechanic, it turned out I needed that.
In general, I would like a bit more polish (like, animations, maybe some particles and so on) and faster character movement.
Nicely done!