Apologies for the long comment, this game really got me thinking!
Very neat, well polished game that feels great to play. It has so many small but important quality of life features that make this feel really good to play. First of all, I love how the menu is built into the game, it's clever. Adding the little trophies make for great motivation as well. I also loved the bit of grace period to get everything lined up if you weren't quite there when the block hit you, because sometimes it can be hard to judge length/height perfectly. I can imagine the gameplay may have felt frustrating at times if not for that grace period. I do agree that there was quite a jump in difficulty around level 4, 1-3 felt a bit too easy but I really enjoyed the difficulty level of 4-5. It took me quite a few tries to beat level 5!
I know it's out of scope for what you would do as part of a game jam, but I could see this being a really great rhythm game if you ever decide to go further with it. The one thing I feel this is missing in this game is the feeling of "flow" in the level, because the levels appear to be randomly generated rather than manually placed. If the levels were designed to feel connected and have the required moves flow into one another, this would really become a fantastic game in my opinion. Overall very well done and polished game!