Its very interesting, like ppl already mentioned it needs a tutorial :D but fun game a bit hard, hmm I couldn't find a spin mechanic anywhere considering the theme of the Jam is spin but even so, good use of rpg maker :D
Viewing post in 3rd Monster Lord's Quest jam comments
You probably didn't buy Whirlwind Slash or Chaos Sword, Whirlwind Slash is spinning attacks while Chaos Sword is throwing the Spinning Sword, also when using Sword Pierce/Chaos Sword the player can do a short spinning attack until the Sword returned back.
You probably also didn't see the game page as everything were described there from control, skill, mechanics, basically the whole gameplay because I'm fully aware I couldn't make the tutorial because there's not much time left.
Additionally all bosses has a Spinning attacks so there's no way you missed them unless you got instantly killed by first boss.
Anyway thanks for trying my game!