I like this type of stealth game. The rules are really clear, and there is enough room for error to learn and get better without a lot of frustrating restarts. Well done!
The adaptive music portion is well implemented too.
I had one issue at the end of level 2, although I had the data and exit the level, the "Next Level" button was not working and a guard eventually pathed over and caught me, restarting the level. admittedly I rage quit here, but might come back and give it another try later.