I was wondering when I would come across a game using the word penalty in a very different way, that's a clever use of the theme. 

I started out with hitting the puck into the wrong goal, lol. I was wondering why no one was following me there. I played the game blindly, reading only about the controls at first, it was really funny to me when I figured out I was put into the penalty box. In the end I was behind 4 - 0 but ended up winning somehow, maybe because the referee saw the opponent fight me (?). The whole idea of having a whole  mechanic to win by cheating got a chuckle out of me.

At first I couldn't see what the hitting was doing, since the visual effect is very subtle and low contrast, this could be improved in an update if you plan on doing so, also combined with sfx maybe.

Funny concept! It was a bit hard to know when the referee was looking, so maybe you could add a sound effect or something to alert the player a bit better? Would be nice to see more effects and sounds in general too, like a smack when you hit the puck or the other players.