Really nice, charming, cosy. As Paper Shape said your real timer isn't reset (I used a stopwatch and it did indeed game over at the time the first timer would've ran out).
I like the idea of Minecraft on a timer. I like that each of the environments are different, one going downstairs, one going upstairs and being more rocky. It's a well designed level (obviously if you had more time I would say the collision map should be separate from the prefab models, because it was quite easy to get stuck on carpet of all things :D ). The sound selection was very good, the music was a bit 'static' in that it was the same level of intensity throughout, which is kinda fine, but it 'droned' on a bit.
Cool idea, I would like to see what happens when you win but I can't get there due to the timer bug.
This does give me the idea of the ship game (the one you reviewed for me thank you) to have some way of 'releasing coolant' to increase the countdown or something like that :D