Really nice little quest!
I liked the pixel art, the original 'battle' system and the effort you bring in telling the story and the tutorial.
About the possible improvements, I think you should add a compass (plus it seems that when we come back from a battle, the orientation can change). The main path is marked by some banners, but it lack of some reward for those who explore other areas (I had a game over for exploring too much). I was gaining positivity but it didn't help much since I spent all my memories while exploring. Is there any use of the positivity stat, I did not understand that part?
It could be nice to access memories and knowing positivity when we are not in battle. The 'puzzle' room should probably be smaller (and maybe add some mechanics more like a puzzle, like not being able to walk twice on the same tile) :D
Great work!