You know, that makes me feel so much better to know that you also struggled! Honestly I feel like such a smooth brain when I'm playing puzzle games!
It is super tricky to decide how to get the variety, but having varied puzzle sizes is actually a great idea. Although for a jam it's probably in a great place size and difficulty-wise, perhaps it's only a consideration if you ever come back to it
Thanks for coming back to me all the additional info.