Wooow, I certainly did not expect that! Loved the quotes from the boss and its laser attack. The sfx were on point too!
But does the bosses' health bar really decrease when he gets shot at? Because it didn't seem like that. Besides that, it felt like the jump was getting delayed a bit? It didn't jump immediately after pressing the space bar. Also, I would have loved that getting on top of the platforms was easier, maybe not colliding with them when jumping from below would be a great addition.
All in all, what a great experience! The SFX really made a difference in this game. Top marks!