Huh. Either this was seriously buggy for me, or it's mostly unfinished? The mines seemed to teleport me around but not reset the boss's health so...does that count as actually dying? The game didn't end when the boss hit 0 health: it just kept counting negative. The "beam" was a really slow-moving ball that just stuck to the boss and didn't seem to do anything.
It took me way too long to realize that the boss was up in the air. "People never look up", heh. But that's on me. Though maybe there's some way to do a directional flash of light or something that would point to him?
And 1000 health just seemed like too much when you were only doing one damage at a time. Even when I cheesed it and got him just over the corner of a building so I could stand there and just hold the fire button, it took what felt like several minutes.
And...now that sounds hopelessly negative. I actually loved the concept,and even in this state it was surprisingly fun to play for a little while. I could see where you were going with it. It just seemed like you ran out of time to finish it, or maybe it's just broken on my computer.