Cool game! I loved the style of art you chose and you had some pretty anxiety inducing situations. I like the idea of having to find keys to navigate around.
Could've used some music and the main enemy (brother?) was cool looking but should probably make some noise. I could imagine being chased by that like in Amnesia or something where there is visual and auditory feedback that it is chasing you. Lighting could probably be a bit darker too to set the scene a bit.
Fun game though and well done!