The presentation here is fantastic, and it's impressive that you've managed to make 20 levels for one small jam game, and they all seem to be good quality puzzles as well. The speedup button is also an incredibly nice touch that makes solving levels a lot less of a slog.
I only have 2 small bits of feedback - I'd make the movement display a lot more compact, as scrolling back and forth to view the upcoming moves can be incredibly tedious, I'd rather always know what my character is about to do - and I'd also add a tiny bit of feedback to the movable blocks when I hover them - the fact that I could grab them was a bit unclear on my first playthrough.
Overall great game, I hope you expand this into a full release soon!