A game with decent visuals and audio leading to a nice user experience; the addition of character selection is also a good addition contributing to prolonged engagement with the game in order to unlock the additional characters. Comfortably meets the requirements and contains the core aspects of the genre.
Gameplay is a little lacking, which is a key part of any game of course, devolving into rapid button mashing and an absence of player feedback outside of some text which at times can be a bit hard to see. Some form of health bars or animations on hit would go a long way to understanding whether or not hits are registering. Despite the visuals, there isn't much 'game' here unfortunately, and I feel like perhaps more could have been done in the time that was given. Having the same hurtbox size for both characters can make doing damage whilst avoiding it yourself incredibly difficult, there should be a consistent way to reduce or negate damage to provide some more complex depth. Finally, just adding more enemies is a poor way of increasing difficulty, just like increasing health and damage taken (looking at you Borderlands 2!). Are there better ways to make the game more difficult as you progress?
Overall, this is an entirely serviceable submission which unfortunately has fairly shallow gameplay. Building upon the foundations that you have established would result in a much stronger submission. Use what you have learned in this process to perhaps make stronger games in the future! Good effort, nonetheless.