You created the dark mood really well in this game. Maybe add in a rain layer in front of the action as well just to increase the immersion feel. I found the puzzles to be pleasantly subtle and a refreshing change from most mindless platformers but it was weakened by the lack of story.
Her attack was also really too weak. She has a massive sword with only a feeble thrust that takes 3 hits to kill the first enemy... Maybe the sword was too heavy for her? A fancier attack animation or multiple attack animations would also increase the visual appeal.
The jumping was frustrating. The slow start to the jump made timing platform jumps difficult and the slow direction change also made me fall down holes or hit enemies or spikes alot. This is compounded by the precision needed everywhere in this game. I eventually got it after a few tries but eventually I got bored replaying the same level over and over so I didn't play past Level 3.
On a side note, the easier difficulty didn't help me because I wasn't dying from losing health but from missing platforms and falling down holes.
Really good submission considering this is your first posted game however. Please make more. :)