An exceptionally polished game, to the point of being almost unbelievable that this was made in only 4 days. The game design is very well thought out. This had me scratching by head, trying to come up with the most optimal tile placement. Really scratches that min/max itch. The animations and feedback when you finally close that big cluster that's you've been working on is super well done. Makes the effort all worth it. If it was me, I would lean even more into that, maybe recount all the tiles at the end of a level and watch your score being added before opening the update windows.
Small things: The music is great at first but quickly becomes repetitive.
There doesn't seem to be anything to do with the theme of this jam. For all we know, this could have been worked on for months and released just now. I'm not saying that's what you did, but game jams having a theme to prevent people from doing exactly that is kind of the whole point.
Apart from that, this game is a gem!