Super unique idea, and it's right at the core of the theme! I think a lot of games gave players control over freezing AND unfreezing, it's nice to see one where you can only freeze. It works out quite well and feels like being a babysitter lol.
It's great that you made your own music for the game, I think it must have taken a lot of effort! A bit of a pity you can't hear much of instruments that aren't strings as the player lol.
Btw I also did music on my team's game and I also used some strings. In my case it was from the logic pro library. One thing I learned during the jam is modulating expression in midi. I used it to give the strings a bit of a feeling that they are being played for real, that are being kind of faded in and out, so it doesn't sound like someone just pressed the strings button for 1 beat. I used this video to help me: https://www.youtube.com/watch?v=gCmH-YMtVPU it's for Logic Pro, but maybe you can find something similar in your DAW if you use something else. Hope this made sense, I just found it super useful and thought you might too!!
Overall a nice idea, and it could get quite varied with different types of music and such! Well done for a solo dev.