This game has too simplistic gameplay, you should have added something that would make this more than attack button smashing. For instance you could have added a kick attack that is slower but has more range and damage so it is better against melee guys. Then you could have added knife throwing guys in stead of another melee guy who's projectiles to avoid and then beat up in close range with faster punch attack because kick allows them to have a time window to throw a knife but fast punches send them into hit recovery animation. And voila your game has manifold higher game play value, while still being simple.
Animation and sound also were simple but they were acceptable in a funny way, it's gameplay that buries this game.