hahaha I really liked the idea and the animations were pretty nice, the boss sprite was also very well designed and I loved the music, it fit the game fairly well. I think having the heroes not collide with each other would've made it a lot more engaging but it was still a fun experience for me. The dialogue from the boss while facing the heros was also a nice touch that reminded you why you were doing all this. I really enjoyed :D
I would love it if you could check out JANTA-9, I made something with a focus on bosses aswell