This is a fun little idea, and a great prototype for something bigger. I thought the monster designed were fun, and music was great, and the core concept has a lot of potential.
My main feedback would be about focusing on the player having agency. Which is hard with randomness, I know, but it often felt like I was hitting attack until I got low on health, and then hitting Item. I very rarely touched "Skill" because it often failed on me. While playing, I thought that maybe Skill should be tied to even numbers or something, to give a 50% chance. But maybe that becomes too powerful and you don't want to use Fight anymore.
Would love to see this idea grow, especially if you can add other classes and a leveling system. There's lots of room to grow. Great work!