Pretty interesting exploration game, I like the idea of moving around in this dark dungeon to find keys/solve puzzles and move on to the next room! I agree with other comments about holding down a button; I also wish WASD was an option as well. Also agree that more levels like the 3rd level puzzle would be great; you could make this a puzzle game where the objective is to figure out how to move on, in addition to the key-searching.
Overall, solid entry; great job!