I really like the concept and the art style! The puzzles in the later levels are actually pretty difficult for me (in a good way!) They really make me want to keep trying until I can solve them lol
Also I might have missed it, but I think it would be nice to be able to see which area each piece will cover before placing it.
But honestly, I always love a good puzzle game, and this is really solid work for just 3 days! Great job!!