Wow! Compliments!
Really enjoyed the experience. The game art is really good, simple yet it goes perfectly with the rest of the game.
The game mechanic is fun, I also enjoyed the puzzle aspect in the game.
As pointed out by others there should be something that tells you when a door needs a key and when does it not, but other than that the game is awesome and well polished. The levels are well thought and the number of bullets are on point, not too many and not too few.
I liked the colors used, especially good use of lights inside the game. The red light used on the creature really makes it stand out!
I was also really curious about the story of the game.
Really good job!