Hey there, thank you very much for your feedback and bug report!
There's a ton of things that need to be improved regarding the combat system, and I have to find ways to force the players to vary their strategies. I noticed what you mention too and actually, it kind of applies to every enemy who has more than one HP, so I'm currently trying to find some solutions. One could be, for example, to add way more HPs to the enemies so the attacks can have more important differences in term of power, making it so the jab only is dealing minimum damages and used for reacting quickly. Another solution is, as you said, creating a hitstun state for enemies when they get combo'd, and I'm thinking about enemies that need you to perform specific attacks in order to get hit.
Thank you very much again!