Hey, it's Leon here. Overall it is a pretty impressive work. I would really suggest you play other roughlike games to get some inspiration. Some note I jotted down for you.
1. Enemies should not follow the player to everywhere, especially should not interrupt the interaction with NPC
2. Sometimes the text box with NPC blocks the player views
3. I like we can see the Large NPC model when interacting, but the overall UI experience is a bit overwhelming. Hiding the HUD might help.
4. The HUD is also a bit messy, too many number and too many things happening at the same time. Players could not focus. Hides those irrelevant and only show them when it becomes relevant.
5. The level tranisition is not clear. Level is colorful but I do feel a bit overloading.
6. No clear goal or guide. Need levels to slowly introduce the mechanics.
7. No intro to help player to know the context or world building. Need more narrative elements.