The first thing i noticed was the cool artstyle. Like the TV Effect and the Monster design!
The Music loop suited the Game well too.
Some things that were unclear to me in the beginning was where to attack the Monster. Maybe a small pulsing animation would make them stand out more, so even blind players like me spot it directly :D. Or it could maybe look cool to have a animation effect in the Monster.
Having to time the punches was a cool idea, but getting more people to cheer you on, felt unneeded at some point, when it was already a big crowd. Maybe you could add that they try to leave after a bit of time?
Soo in general the game was nice and fun to play and pretty polished for 2 weeks!