Very good concept. Loved the ambiance and the art in this game! Maybe it's a little too dark, like you probably need a lighter background so we can see properly the elements on screen. You need to add a wall in the beginning at the left because I also was trapped in the infinite fall haha it was klinda funny, tho. I really like the fact that you can have your username in the game, it makes me more invested.
It's a really cool game, too bad it's not finished. I made it to the second arena.
You did a great job!