This is an awesome game. Definitely a strong starting point for a great RPG/Dungeon/Etc. Here's my feedback:
1. The pace feels slow, moving one 'tile' at a time is unexpected for a game in 2D perspective.
2. Add the HP and MP of enemies. Helps with the player's strategy, like "should I use my most powerful spell, or a minor attack?"
3. Is there any reason for needing the mouse to interact with doors or take items, instead of solely using the keyboard?