Fun game! I enjoyed the simple art style and the different hiding places. It had really clean controls and was nice that the hiding spots and stolen items increased as the levels went up. Great fun with the sneaky music.
The only critic I can really give is that your font/ chalk board set up (while great to have for tutorial purposes!) made me think that I was sneaking through a school instead of a museum? So maybe from an aesthetic stand point a more "museum-esk" appearance would be better.