This was a fun little game! The mechanics are simple enough that it's easy to wrap your head around them right away, but then you did a great job of squeezing some difficulty out of them and put together puzzles that require a variety of different strategies. The visuals are minimalist but really solid; it looks really nice and polished, and t was satisfying to watch the tiles march around and fill things out, though I might have liked a slide to adjust the speed at which they move (it was a little slow for my taste). I also wanted an undo button, or to be able to grab a tile I had just placed to put it somewhere else without needing to reset the whole level. And as others mentioned, some background music and sound effects would do a lot to enhance the feel of the game.
But even without audio, this was a really fun entry. I thought the difficulty of the puzzles was tuned nicely; things were doable without a lot of guess-and-check, but not so simple as to be trivial. Really nice job on the puzzle design.
All-in-all, this was a really solid jam entry, and I enjoyed playing it. Nice work!