Nice game, The artstyle is well done. I feel you could have added a more "Puzzle" element to the game with "demon form", but its ok.
the melee combat is really hard, and your sprite is over the attack animation (which you usually dont want). To fix this, go to either the sprite renderer of the attack and increase "Order in Layer" or go to sprite renderer of player and decrease order in layer.
To fix the combat, i would increase the attack radius, i feel its too small.
Finally, the player animations. I would have created an idle animation, and using the animator component create a bool for player moving to check between animations (This isnt a good option when you have to deal with too many animations with sprite sheets, but its simpler when you have few like here).
Finally, you should set transform.rotation of player in Update/FixedUpdate equal to Quaternion.Euler(0,0, transform.rotation.z). That way, when you flip the player it will stay flipped and wont turn back.
overall, Nice Job :D
feel free to check out my game