Really cool WIP.
The combo system is great and the sprite animations are very good!
Some suggestions you can consider for the next version:
1 - Add a setting to start in Window mode. The game doesn't look good when it goes full screen in ultrawide monitor.
2 - Add a FPS limiter or sync to the monitor max refresh rate. I saw the game FPS counter go over 3000 when I tried it.
3 - Implement multiplayer (local or online) or add a computer controlled (AI) player 2 that fights back.
4 - Add game controller (gamepad / joystick) support.
Good job! :)