This was a really cool idea overall. I especially liked the upgrade system and how you made the hero stronger by gaining viewers, turning that into a mini-game was a clever touch and felt very on theme. I do agree with Kebberz that it would’ve been nice to be able to reposition or swap sides more during the fight, especially when the monster corners you on the right side of the screen.
One small thing that could elevate the monster fight even more might be having the teeth move to attack the player rather than staying stationary. That said, the encounter still worked well, and I really loved the color choices, it was always clear where to hit. Nice job overall!