Gee, it sure was nice of you to disable the ability to turn off the ghost rooms for the first couple of levels after they were introduced. Those of us with slow computers that really couldn't cope with those levels with the ghost rooms on really appreciate it.
If it wasn't for that, I'd give 5. But that is a sore point for me, so 3/5.
I'm with King_Neoterikos... if this game ended at level 50, it'd be 5/5, if a big easy.
The levels after that though... often, even if you could see the actual image, rather than the 1D scan, I still wouldn't be able to guess it (in some cases, even if I knew what the object in question was, but couldn't guess the name). Which makes it more a guessing game than a puzzle, and drags the score down to 3/5.
Level 10 was by far the hardest... 11 and 12 were easy by comparison. (12 I got first try, 11 I would've got first try except for a typo).
If it had better controls (read: keyboard), I'd give 5/5... but drag&drop gets tedious (and having the drag pick up the wrong tile 'cause of lag gets annoying quick), so 4/5.
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