Lovely little game, great use of the "running out of space" theme! The little animations like the smoke from blocks falling and on the warning symbol are also quite nice. Mind if I ask what the blue tile was?
Agreed with metalsnail, but speeding up the simulation for the ending part would have been a cool addition - I assume you're finished with this one now though, so heh, whatever :)
(found with the game randomizer :))