Ah this is tricky. I'm not sure what kind of feedback I can give! It's an interesting concept, but I think it doesn't really land for me. I get that you want the player to fiddle with the speeding up and down to synchronise the loops, but the math of it doesn't really come naturally to me, so I end up just either trial and erroring or offsetting the loops and waiting. Neither of which feels very rewarding when I finish a level. I went AFK for dinner during a level and came back to it being solved.
I like the idea of maybe using sound / rhythms to sound out the puzzles. Like a 4/4 rhythm overlayed with a 3/4 or a 6/4 by letting the boxes make sounds on certain tiles, i think it would end up sounding cool at least, and maybe add an extra dimension.
Other than, I like the visuals, and it ran well! Congratulations, and good job on a successful game jam!