Love the overarching pixel look to the whole entire game! Also the topic is super relatable since mid-terms are always a stressful time.
I think that having different level layouts would have really helped in establishing harder difficulties even if the game is pvp. Even though there was the element of your health constantly decreasing, instead of changing the rate in which your health drops having more difficult levels would have provided a more fruitful difficulty curve. You already have the assets and the art style so it would just be a matter of designing the layout and building it out. The design choices that were made though are understandable since both players are competing against each other.
Cute game overall, and relatable to boot!