Oh my god I'm so bad at this game, died 3 times in about 30 minutes ^^; Which doesn't mean I don't like it, it is actually quite addictive! First, I love pixel art so graphics are great to me. So is the music, gives a nice dark atmosphere.
A few things though:
A bit more instructions from start wouldn't go amiss to get familiar with the UI and controls.
Controls: I understand the need to the delay the player's move to allow for turning in place, but the stuttering/jittering gets a bit distracting when moving around normally. Would there be any way to ease on that?
Also, it is a nitpick, but would there be a way for the tile/frame that follows the player to actually be below the sprite instead of above?
Some bugs I encountered: Playing in English, the message about receiving damage is in Spanish (recibe daño).
Currency is called "Novatis"? But when you die (and it happened to me a few times xD) it says you've lost "Crystals" instead.
Overall good game, keep up the work!