The art style was nice, with the voice acting being especially good. I didn't understand what was with the blocks -- the blocks that the main character was holding was smaller than the block that was presumably taken out of the building.
The animation was smooth; however, the house looked, well, almost 2d and straight. I don't know about others, but I think the house should've been more, well, blocky? I found the flash a bit funny, though.
It was a bit too short for my liking, but hey, this could be the start of a new series!
~~ Summary ~~
~~ Good points ~~
1) Nice art style
2) Fluid animation
3) Outstanding voice acting
~~ Bad points ~~
1) I didn't understand some parts, though this can be safely ignored
2) Blocks weren't the same size (although this may be ignored)
3) Too short for my liking