Very fun game! The multiple solutions in the last map, intentional or not, makes me feel like a smarter player. It seems like this kind of game can have multiple ways to win a puzzle, but one is not necessarily easier than the others. Your "life" mechanic makes this possible, combined with the way the enemy missiles interact with other enemies.
Love the "duck noir" kind of music, and the simple yet powerful mouse control.
The only "buggy" stuff I saw was that enemy projectiles stop following you if they go outside of screen vision, but they continue when you go back to it again. Very minor thing.
Well done!