A decent attempt at making a beat-em-up game with some nice visuals, both with character and environment art, and some audio work. A decent level of player feedback with the particle effects when you or the slime are hurt and being able to differentiate between the two. A good foundation from which to build a game that could be placed on a marketplace.
However, I do feel like there is a difficulty problem. Firstly enemies spawn way too quickly for the attack speed/damage that the character is able to do, and sharing similar hitbox size it is difficult to avoid getting hit whilst doing damage without some form of block or technical movement. Due to the lack of sprite flipping it is hard to tell whether you are attacking the slimes on the left at all which can make the game quite frustrating to play. In addition, making the game endless strips the game of any goal which makes justifying continued engagement difficult. Finally, you can just walk off screen in any direction and continue doing so making the game loop forever with nothing happening which doesn't necessarily scream "engaging gameplay".
On the whole, it is evident that significant effort was made with the game, particularly surrounding the visuals of the game, however there is room for improvement with the gameplay itself. I think that this is a good submission despite the issues. Good work.