I made a hard game and all the feedback has said its too hard. I think the enjoyment from the game comes from it being hard and given just a little more time players could git gud and win. It was intentionally hard but I made it a little harder than intended, oops! When I submitted the game I literally had not beaten two of the three levels because I was spending all my time coding and didnt have the time to try to beat the harder levels. After the jam was over however I went back and was able to beat both. I completely agree with you that 48 hours is just not enough time to balance and most of the games here are just too hard or too easy. Its so difficult to get the perfect mix.
Heres the game for context: https://itch.io/jam/gmtk-2019/rate/461217