The controls felt good. Moving and jumping was a good speed and felt nice. It had a very "stuck in the computer" feel with visuals, the absence of soundtrack and the only real sound the echoing of footsteps.
I wanted to get farther than I did, but I couldn't figure out how to get the pet to stand on the switch. The Q key did not appear to do anything. I would have liked to get farther. I really love that you went for a 3D Metroidvania. The game felt a bit empty - especially the lack of a soundtrack. Even a background ambient track to make it more creepy would have at least conveyed that was the feel going for.
The gameplay itself was solid, so you've got a good base to build on.