Aloha and thanks for playing again!
Late reply, for i was very ill over the weekend:
Dungeon hiccups happened to me too. I think the minimap showing walls far away is actually just a slight bug for the level transition. Like your character is at the coordinate 20,30 then enters a dungeon which has the entrance at, lets say 10,20, then the transition might be too slow/quick and the map gets updated before the player position will be. The floor with no wall is probably a special case of "the room exactly fits on the egde so we dont have to put up walls". I will fix both of these things until next time.
Most of the other pleasantries you encountered are part of a future dungeon gen overhaul too: Levels feel too big, enemy spawns are really random and theres no challenge apart from higher numbers (see lvl2 or the higher hp of rares).
I agree with the whole projectile stun being too harsh. However i found the way of D1 handling this to be the actual terrifying thing in combat and have fond memories of it. For the way movement and positioning works right now it's hardly possible in another way. Fortunately i committed to experimenting without a grid! This may also influence the blurry movement you noticed.
So i guess you haven't found the Kalemonvo legendary? For now it can only drop in level 2. I actually thought the drop rates were still very high, but i will specifically make guaranteed treasure rooms in the next version, so these things can be better checked out.