I spent so much time playing this, there's so much!!! I haven't gotten as far as others, I honestly got the boots and got stuck from there. The only unexplored tile was one behind an arrow block that shot faster than even the boots could take me! Likely skill issue lol
I don't have much more to add outside of what everyone else has, but this is a really solid game. I think the only things that were a struggle for me were registering hits on enemies, which is already on your list, and some kind of indicator on the maps where they transition to another level, though that one was mostly because half my time playing I didn't realize that there was a global map.
The only bug I ran into a few times not noted in comments was that some room transitions would trip up if you weren't lined up right, walking in would just transition you back to the previous room. Oh, and some rooms with pits would respawn you on the other side in some situations.
Great job!!!