Pretty good start! Will it just be a boss rush type of game or will there be normal mobs and stage hazards/obstacles to overcome?
So far the Heavy Attack seems a bit too good as it lets you chain heavy attacks together unlike the Light Attack. I can do Heavy into Light×3 while the enemy is still stunned for 10+4+4+4= 22 damage, but I can also just do Heavy 3 times for 10+6+6= 22 damage too.
Outside of stun, light attacks only do 2 damage each, so they're just way too weak right now to be even worth anyone's time doing. Increasing the damage to 3 while also increasing Counterattack damage (hitting the enemy during their recovery after their attack) to maybe 5 might make light attacks actually viable.
Maybe change heavy attack to have more range but also a slower attack so that heavy attacks aren't just "Light Attack but better" but instead provides utility.
Anyways that's all I got right now for this prototype. Is the protag a robot girl or something, maybe a cyborg? I love me some robot girls, good luck with your game!