Nice graphics and sound.
Plain and very naive story.
Feels a bit too simple for a stealth+puzzle genre.
Indicators of enemies and their range are nice.

It feels like both entering and exiting closets should be F.  Zero need for additional complication.

If you go to the far right from the very start the door of the second factory won't open but the sound of it opening will still play.

It seems like the death screen is of fixed size which is bigger than my screen resolution (I have a semi-square 1280x1024) and thus it can't fit.

Theme is barely used.

Very nice game! I like the background sound very much.

Keep up the good work!