Love the pixel art, very cute! I think one of the biggest improvements could be to change the control scheme around. Maybe putting the punch button as Q,E,R,F so you don't have to shift hand when trying to move and punch. The multi-level aspect of being able to jump on the tables and the bar were smart and surprised me. A cool little bug (I call it strategy) is to hide under a table on the side and the enemies either stack on top of each other on the table or they are funneled so you can just stand there and spam X.
Great job on completing the game!