One upper cut can be good but do many and it might come off a little silly again depends on the games theme, particle effects and upper cuts are all things than can make the game look and feel better but not necessary, over the top flashy stuff can come off rather cheesy sometimes. Also @roundbeargames I have said this before I really think you should step back a little and figure out first what you want this game to be about, is it a mario styled game?prince of persia, castlevannia, sonic? I feel without this you could build something you regret and have to start over.