My teen and I worked together to solve this. It took a little bit to figure out the basics, but from there it mostly made sense. Between the two of us, we found 10 Downs without needing to look at any hints or solutions.
We needed to look at the solution to solve Level 1. Even with the solution, we're both still having trouble wrapping our heads around it. I figured out certain parts myself, while others did make a bit of sense when we looked at the solutions, but we're still not quite seeing the logic of some of the parts. I don't want to go into too much detail here now, because I don't want to give spoilers for anyone else playing later, but I can try to come back to go over the steps at the end of the jam if that would help or we can message on Discord. We did this one last, since we were able to do Level 2 without completing it and wanted to see how much we could do without looking at hints.
Level 2 was pretty easy. We both solved it on our own.
Level 3 took a bit of thought. We each figured out part on our own, and then talked about it together to solve the rest. It took a bit to figure out, but once we did it made perfect sense. That one was my favorite of the puzzles, while my teen said it was interesting.
The final down was clever. We looked at the hints for it, though figured it out without needing to see the solution. My teen said that was their favorite puzzle.
I liked the different music options, as well as being able to mute the music while keeping the sound on. The sound clue was quite helpful.
Overall, we think you have some clever puzzles here and enjoyed trying to solve them all. I think it might help if you had the puzzles in a different order, maybe having what is currently Level 1 and Level 3 switch places. While Level 2 was the easiest, the way it is currently written makes more sense where it is. That said, you could take the core idea of Level 2 and make it work for Level 1. Level 1 was the hardest to solve, and having it be first might turn people off from trying to do any of the others. My teen only did Level 2 because I suggested it, because of how much they struggled with Level 1 and they assumed 2 was going to be harder. Starting the Level puzzles with something easier and working up to the harder one can help encourage people try to finish the game, instead of giving up early.