I'm an avid fan of puzzle games, especially those of the thinky variety. I thoroughly enjoyed playing this one. Being relatively experienced in the genre, the puzzles weren't super challenging, but the mechanics are simple, elegant, and--most importantly--very well explored.
There's a clear foundation here for a great thinky puzzle game; there's plenty room for both deeper exploration of the mechanics (or expanding them by making use of the verticality through e.g. slopes or ladders), as well as harder puzzle design. For a jam game, however, this is phenomenal. Would love to see this expanded upon post-jam for sure.
Also thank you for having an undo button, it's a nice QOL feature I've been missing in a lot of the other puzzle games made this jam.