Thanks a lot for taking the time to play and leave such detailed feedback!
Yeah, 11 levels is definitely a lot for a game jam. The funny thing is that most of those levels started as experiments. I was constantly testing different puzzle ideas and had a hard time steering them exactly where I wanted, so at some point I just decided to keep them all and went with a "the more the merrier" approach.
I completely agree about the sprint, freeze, and jumping mechanics. I actually wanted to expand the tutorial quite a bit more to properly introduce and reinforce those mechanics before asking the player to use them in harder puzzles, but I ended up running out of time. That's probably why some levels feel like they suddenly expect knowledge that wasn't established strongly enough beforehand.
And yeah, Level 10 is a little evil. Looking back, I can definitely see how having to repeat the entire pattern after a single mistake can become frustrating, especially with the small safe area.
Thanks again for the feedback. It's super useful to hear where players got confused or frustrated, because those are exactly the things I'd focus on improving if I continue developing the game.