Wow, fantastic art style. And a nice story too. I think I played only attack and one or two heals. I tried to run just to test it out, but it seemed quite useless. So my guess if something to play a bit more on the horror aspect, the game could at least made it feel a bit more like I was in a terrible spot fighting and health wise. To really drive home the feeling. A trick I used in my game, that I just learnt about is to not have linear health bars so the player thinks they are running out of health faster than they really are. That might also have made the stims seem like a rare resource. You could even cheat and not level up players until the game thinks they need it.
I also didn’t get first that it was one out of four stims that the health thing was. I read it as some plus slider and only realized after I wasted my first stim without really needing to. Perhaps if the other 3 slots were there but not lit up it’d be clearer what it was.
The monsters were really cute, and again game there was a really strong art direction in the game. I also think that the length was quite right, because much longer then the fun of the jumpscary but simple fights might have become a bit boring.