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.
- 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.
- Some initial equipment might also be nice, just to reduce RNG. Or just spawn some random equipment around the player.
- 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.
- 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 :)