Fun game, and I really liked the art and music. They went well with the game. I looked over the github page and saw some of the features that you wanted to add. Here's a few other features that might also improve the experience.

1. Some small animations. Doesn't need to be anything too dramatic, but an indicator that an attack happened would be nice. Or that you're being attacked. Otherwise everything feels kinda static.
2. Some initial equipment might also be nice, just to reduce RNG. Or just spawn some random equipment around the player.
3. I'm not totally sure how the armor calculation works, but in some cases it looks like certain armor is strictly better than other armor? In that case, should it just auto-equip? That seems like a nice default.
4. As you said in the github README, it's very easy to wander into a high-level biome and instantly die in one hit. That's how most of my runs ended. As a game balance thing, I think it's okay to throw in some high-level monsters into a level, as long as there's a clear indicator that they're hard/impossible to beat, and you have some opportunity to run away from them. The enemy level indicator that's in the game helps a bit with the former, but yeah it would be nice if they didn't instantly kill the player.

Overall, great job! I especially appreciated the music and art :)