This is stupidly polished (as in, very polished).
Minor quibbles: I wasn't paying attention totally during the opening cutscene so I wasn't sure what time I was supposed to finish, so I assumed 8:00 and not 8:30 and began rushing rather than trying to find all the dice and go everywhere. I think maybe the deadline could have been put on the map screen to remind players. Also, it took me like two or three rooms before I realized where the goal was, so I feel like it should call slightly more attention to itself rather than be some small text in a black box. Maybe a big sign saying GOAL right above it or something. Like I said, minor things.
But I'm a sucker for non-linear game design and metroidvanias so I thought this was great.