The game really improved since the prototype, and I really had fun with it. If you ever decide to expand it, might I suggest randomly generated rooms and different times for difficulty levels? It may give it some more replay value (:
Thanks for the feedback! Without saying too much we've actually discussed some sort of randomness in the gameplay, and we're currently working on a build for an event in which we'd like to at least have random tool placements, but we've got limited time to work on the new build and we'd have to completely redesign some stuff around that.
That said, we are absolutely planning on expanding it more in the future, with replay value in mind! ~Matt