I wasn't able to beat the boss, but I still had a pretty good time learning his attack patterns. Furthest I could make it was phase 4 - all the instant-death moves got kinda annoying for me. I get he's overpowered on purpose to encourage you to do the minigames, but I felt the grind wouldn't have been worth it. That's really my only gripe though, everything else was top-notch. The art and presentation in particular really stood out, especially considering you made it all yourself! The character also felt really good to control. If you made a boss rush game like Furi, I would pay money for it.