Thank you. I'm never certain on button allocation. I'd check more games later to find a kind of common layout, also for the keyboard. Then add a config screen. Then definitely more bosses will come later, as I think I'll keep developing this.
Usually button south | X on playstation | A on Xbox are used for jumping. While button west | ▢ on playstation | X on Xbox are used for basic attack. The button mapping you have for spawning platforms seems perfectly fine.