The concept of this game, though not immediately clear to me at least (the tutorial doesn't seem to function), is cool! It incorporates the prerequisite excellently as you choose between charging, attacking or healing. Though the main theme is not very present I feel like.
The sound of getting damaged however is very big, it's quite loud haha. I initially thought charge meant charging toward the enemy, but it means charging up to do more damage, which wasn't clear at first. The tutorial would be very useful to have, though an indicator on how much damage you'll deal by attacking, with text such as "Damage x Charge", could solve this without the need for a tutorial.
The art style is cute, though it is a bit mismatched with the UI, some more cohesion would make this game feel more polished, as would some more juice and feedback. Overally I'd say the idea behind the game is entertaining, it's like a chess game but you're boxing, but the execution leaves some things to be desired. Sweet concept though.