I liked the game as well. Not being a native English speaker, I had a problem with one of the word puzzles (star-hook), but after I got this with some help, I could finish the game.
One technical problem I encountered (playing full screen on Windows): I had to Alt-Tab out of the game because of some email I received. When I was back, the on screen reticle seemed to be a bit out of sync with what the real hit test area was, so I could not hit the second light switch. Using ESC and then Resume corrected this. I'm not sure if this is something you can do anything about or if it is a Unity problem.