I found the puzzles pretty hard to grok sometimes, and the timer makes it hard/stressful to think solutions through. I think it would be more interesting and fun if you had just made 20 (or more) premade puzzles without a timer (though I also understand that designing those puzzles by hand would've costed more dev time).
Viewing post in Particular Puzzles jam comments
Yeah, it's definitely on the more challenging side. I wanted to hand-design some puzzles and I ended up doing so for the tutorial. After reading your comment, I realized that I should have called the tutorial "Story Mode" and have the current game be an Endless Mode. There are 15 handmade puzzles in the tutorial so that would be like what you're saying. I appreciate your feedback and getting me to think about this more, thanks for playing my game! :)