This is a decent little entry. I like the look of the game and the contrasts in its colour palette. The character attack animation also looks pretty good.
Some thoughts:
- The game is tiny on my monitor, meaning it was hard to see and play the game. I couldn't find a way make it larger through settings or the window.
- I think the jump button should be separate from the movement keys. Making jump the 'z' button for example would make platforming easier on keyboard.
- You might consider adding some other sounds (like a whoosh for jump) to create a better feel to the movement.
Good luck with continuing the project!