Extremely solid, well-polished game, especially for 72 hours! The art and music is simply gorgeous, and the gameplay is good, casual fun, even though it was very confusing what the actual goal is.
I think what the game needs is the ability to rotate pieces, the ability to control the owl via the arrow keys, and it should immediately clear the level if you manged to fill in the shape within the time limit.
Other than that, though, the game is great! Keep up the good work!