Hey. Thank you for playing the game!
I intend to have less key hunting and more puzzles in my next game which you can learn more about on my Twitter. You figure out the story interacting with objects / reading journal pages. Most of the objects have some meaning relating to the story. I also created a lot of the paintings in the game myself and transfered the textures.
Currently most of the keys in Perdita for doors / drawers are not too hard to find. You also need to collect the gas can to remove the arms from the stairs, and later you need the axe for something. The one key though that could be tricky for some, might be the one actually in the bathroom, it is located behind the cracked wood in the bathroom if you look through the crack you will find it! I hope you will try the game again and complete it. Thank you for your feedback! I appreciate it.