Thanks for the review!
I started designing the levels too late and just wanted to show all the features I had planned at least once, so features being underutilised make sense! A reason why I didn't use the reset more is, that it was a giant pain to make working Puzzles with it. The places where the boxes need to be for the level to be completable would have certainly helped with that and is a great suggestion!
A few days after I submitted I went through the game again and also noticed that the hint for level 9 is a little too obvious while level 8 could desperately use some hint. I guess that's just a result of only having other people playtest the game after sumbissions are over.
The meta puzzle was for the submitted version completely ignored. But it would have been that at some point you learn that you can go back a level when standing on the starting tile of the level leading you to the end of the previous level. You then would have been able to complete every level in reverse and go back a level in level 1 to a level 0. Now that I am writting that down I am unsure how "meta" it really would have been and I am realising that it would have been far too big of a task for the jam!