Simple concept, fun execution! I love the artstyle, the puzzles, and the almost sandboxy way in which you designed the game, where you can, in general, solve it your own way as long as you get the right solution in the end (or, at least, that's how it felt to me.) One nitpick I have is that it was a bit confusing to me that you had to build the structure at an exact location on the grid, but other than that, amazing job!