I loved the stealth gameplay (I'm a sucker for stealth), but I didn't get the rhythm part. The boxes just kept coming at the same intervals for a really long time, and I didn't know if they were supposed to stop or not.
Overall I think, that in short jams like this one, it's better bo focus on one mechanic, and I kinda feel that if this was a purely stealth game it would have been better.
Keep up the good work!