I really like what you have here, it's something that I caught on to right away. And with one illustration and some deftly chosen enemies you set the stage for this world. You did something that others haven't routinely thought about for this Jam - you let the lightest part be the world and characters which leaves the players plenty of imaginative space to dictate their journaling. Many other left it open in the rules, but you swept that away and left us with something very clean.
I can see what M. Kirin in saying, For rock paper scissor to work and not interrupt the immersion of the player it has to feel a certain way. What may be also true is...maybe you don't need block? Maybe block becomes something else like, "Charge" or "Gather Strength" so you can really BOOM your next attack, or your enemy can too. The issue there would be - what if you enemy just keeps doing it? You'd need something along the lines of what they mentioned where they wouldn't be able to choose that one the next turn or something. Thinking about this as I write, it seems that having what they do set IS the best way forward for the enemies. You may even be able to do that based on the weapon. What if Pokers ALWAYS attacked?
But that's the smoothing portion of things, and as long as you're willing to re-work it I think you have a stellar entry. You're always miles ahead of others, so I hope you're feeling really good about what you've created.