Brilliant game, fantastic idea. I don't mind having to play this a few times over. IMHO being able to play yourself into a corner enhances this game. Well, maybe a few checkpoints could make it better though rather than having to replay from the very beginning.
Yes, there are a few bugs in here. It can be a bit annoying to wait for items to become clickable when building a stack. I also got caught in the time loop where the game just stops and only a complete reload sorts the problem. These are minor things though that can be sorted. They don't change the fact that you created a very new and unique approach to an old game genre.
I would have loved to have a bit more of an end though :)