Left and right arrow keys to move between rooms. Left-click to interact. The 'puzzles' are fairly easy, so take your time and enjoy the mystery.
E.N. on sounds, L.B. on graphics, and myself on code. Total time spent was approximately 18 hours solid together.
Developer commentary video walkthrough
I ran through the game in about ten minutes if you just want the story and some behind-the-scenes commentary.
/u/jujuadams' excellent dialogue code was used to generate interactions.