Holy hell, the visuals look astonishing. Animation variety is pretty limited, but the animations that do appear are very simple yet fluid. Love that you implemented a spear platform mechanic, since it makes the game feel more sensible and down-to-earth.
Story seems pretty interesting; a woman who seeks heirage(?) from laser dude. I wonder how you envisioned the rest of the story, since you did say there's supposed to be a level before this fight.
If there's something I saw that needed more work, I think there lacked a bit more "helpful" vfx/indicators during the second half of the fight. The arena laser sweep only had a 1-2-3 kind of indicator from the boss sprite; that means you dunno what's going on when you run to the other side to dodge. There's also the bombs not showing an explosion effect when attacked. I may just be wrong, but for me the bombs just disappear when I attack them.
But yeah, aside from the previous paragraph, fight was great. I almost no-hit during my 2 win attempts, but the experience was cool. Looking forward to the updated version.